Lake Victoria Mining Co. Gravity, Flotation and Cyanide Leach Test Work. Prepared for:

Transcription

1 Lake Victoria Mining Co. Gravity, Flotation and Cyanide Leach Test Work Prepared for: Dave Kalenuik Lake Victoria Mining Co. # West Hastings St. Vancouver, BC Canada V6B 1N2 (604) Prepared by: Met-Solve Laboratories Inc. 101B Street Langley, BC V1M 4A3 Canada Project Number: MS1450 Wilhelm Tse, B.A.Sc. Metallurgist Ish Grewal, M.A.Sc. P.Eng President April 18, 2013 Note: This report refers to the samples as received. The information contained in this report is provided 'as is' without warranty of any kind with respect to the interpretation and use of the data by the client. 101B Street Langley, BC CANADA V1M 4A3 Tel: Fax:

2 Project MS1450 Lake Victoria Mining 1.0 BACKGROUND Met-Solve Laboratories Inc. was contracted by Lake Victoria Mining to conduct gravity concentration, flotation and cyanide leach test work on an ore sample from Tanzania, Africa. Two buckets of sample, ~20 kg of coarse crushed and ~15 kg of fine crushed rocks were received from Lake Victoria Mining on February 21 st, 2013 for testing. The primary objectives of this test program were to: a) Determine the amount of gravity recoverable gold (GRG) content present b) Determine the overall gold recovery from a gravity + flotation process using two different flotation reagent schemes c) Determine the overall gold recovery from a cyanide bottle-leach test as follows: i. 1.0 g/l CN for a duration of 48 hours on gravity tails ii g/l CN for a duration of 24 hours on flotation concentrate (1 st reagent scheme) iii g/l CN for a duration of 24 hours on flotation concentrate (2 nd reagent scheme) 1

3 Project MS1450 Lake Victoria Mining 2.0 TEST PROCEDURES Descriptions of the metallurgical tests completed are presented below. Test # NS102 NS103 NS104 NS201 NS202 NS203 Description Gravity (3-Stages) Flotation on Gravity Tails (1 st Reagent Scheme) Flotation on Gravity Tails (2 nd Reagent Scheme) Cyanide Leach on Gravity Tails Cyanide Leach on NS103 Float Concentrate Cyanide Leach on NS104 Float Concentrate The Lake Victoria sample was subject to the following preparation and test procedures: 1. Crushing and rotary splitting of the received sample 2. A 3-Stage, 10 kg, GRG test using a laboratory scale Falcon L40 centrifugal concentrator, at a final grind of 71 microns (P 80 ) 3. Two ~4 kg flotation test on gravity tails 4. Cyanide leach test on gravity tails 5. Cyanide leach test on each flotation concentrate 2

4 Project MS1450 Lake Victoria Mining 3.0 RESULTS AND DISCUSSION The individual test summaries and detailed mass balances are organized in the Appendices according to the order presented in Table I. Table I: Appendix List Appendix Content Test # A Overall Flow Sheet - Recovery Summary NS102 - NS203 B Gravity Concentration NS102 C Flotation on Gravity Tails NS103 - NS104 D Cyanide Leach NS201 - NS203 E Assay Summary The Lake Victoria sample had an assayed head grade of 9.80 g/t gold and a calculated head grade of 9.44 g/t gold (back-calculated from the gravity test work). 3

5 Project MS1450 Lake Victoria Mining 3.1 GRAVITY CONCENTRATION A 10 kg representative sub-sample was screened at 1,295 microns prior to gravity concentration test work. The undersize was processed through the Falcon L40 three times with grinding applied after the first and second stages respectfully. After each stage, the concentrates were panned to examine the upgradeability of the material. The gravity tails were subject to a cyanide leach test (NS201) and two flotation tests (NS103 and NS104). The flow sheet of the gravity test work is presented in Figure 1. Figure 1: Flow Sheet Diagram for Gravity Test Work Feed µm Grind 8 min to 295µm Grind 36 min to 71 µm Pan Tail 1 L40 Tails Pan Con 1 Pan Tail 2 Pan Con 2 Pan Tail 3 Pan Con 3 The gravity results are presented in Table II below. Table II: Test NS102 Gravity Test Summary (Final P 80 = 71 microns) Products Weight Assay (g/t) Distribution (%) (g) (%) Au Au Pan Concentrate Pan Tail L40 Concentrate Pan Concentrate Pan Tail L40 Concentrate Pan Concentrate , Pan Tail L40 Concentrate Total L40 Concentrate L40 Tails 9, Calculated Head 9, Assayed Head 9.80 The gravity concentration test achieved a gold recovery of 60.6% at a final grind size of 71 microns. Higher grade in the 3 rd liberating the gold. pass indicates that finer grinding appears to be important for 4

6 Project MS1450 Lake Victoria Mining 3.2 FLOTATION ON GRAVITY TAILS Two flotation tests (Test NS103 and NS104) were done on the gravity tails using copper sulfate (CuSO 4 ), potassium amyl xanthate (PAX) and MIBC to determine the overall recovery from a combined gravity and flotation process. Sodium silicate (Na 2 SiO 3 ) was used in one of the tests (NS104) to aid the dispersion of clay particles during flotation. The results of the flotation tests are presented in Table III and Table IV. Table III: Test NS103 Flotation Recovery on Gravity Tails Products Weight Assay (g/t) Distribution (%) (g) (%) Au Ag S (%) Au Ag S Total Flotation Con * Tails 3, < Calculated Head 3, NS102 Gravity Tails *Back-calculated assay grade from cyanidation (Insufficient sample for assay) Table IV: Test NS104 Flotation Recovery on Gravity Tails (Includes Na 2 SiO 3 ) Products Weight Assay (g/t) Distribution (%) (g) (%) Au Ag S (%) Au Ag S Total Flotation Con Tails 3, < Calculated Head 3, NS102 Gravity Tails Flotation of the gravity tails generated recoveries 59.5% and 61.5% of the remaining gold. Adding sodium silicate did not show any change in overall gold recovery. Although the float test was done in stages, the flotation concentrate was collected in bulk rather than in individual stages since the concentrate was required for cyanide leach test work. A small sub-sample of the bulk concentrate was assayed and the remainder was used for the intensive cyanide leach tests (NS202 and NS203). 5

7 Project MS1450 Lake Victoria Mining 3.3 CYANIDE LEACH Flotation concentrates from Test NS103 and Test NS104 as well as a sub-sample of the gravity tails from Test NS102 was subject to cyanide leach tests. The cyanide leach test on the gravity tails (Test NS201) was leached with a 1.0 g/l NaCN solution for a duration of 48 hours. Sub-samples of the leach solution were taken at 1, 6 and 24 hours. The intensive cyanide leach test on the flotation concentrates (Test NS202 and NS203) was leached with a 1.0 g/l NaCN solution for a duration of 48 hours. Sub-samples of the leach solution were taken at 1, 6 and 24 hours. For all the tests, lime was added as a10% slurry to maintain a ph above The results from the cyanide leach tests are presented below in Table V Table VII. Table V: Test NS201 Cyanide Leach on Gravity Tails Products / Time Sol. Wt. Assay (ppm) Distribution (%) (g) Au Au 1 hour hours hours hours Residue Calculated Head NS102 Gravity Tails

8 Project MS1450 Lake Victoria Mining Table VI: Test NS202 Cyanide Leach on Flotation Test NS103 Concentrate Products / Time Sol. Wt. Assay (ppm) Distribution (%) (g) Au Au 1 hour hours hours hours Residue Calculated Head NS103 Float Con - Table VII: Test NS203 Cyanide Leach on Flotation Test NS104 Concentrate Products / Time Sol. Wt. Assay (ppm) Distribution (%) (g) Au Au 1 hour hours hours hours Residue Calculated Head NS104 Float Con

9 Project MS1450 Lake Victoria Mining Cyanide leaching achieved 88.5% gold recovery from the gravity tailings (Test NS201) and recovered most of the gold within 24 hours. The leach residue gold grades assayed at 0.46 g/t. Cyanide leaching on the flotation concentrates achieved excellent gold recoveries of 94.7% and 94.2%. Most of the gold was recovered within 3 hours. Note that cyanide leaching on the flotation concentrates contained high gold grades (> 4.0 g/t) in the leach residue. A summary of the cyanide consumption is presented below. Test NaCN Conc. (g/l) Leach Duration (hrs) Calc. Head (g/t) Residue (g/t) Au Recovered (%) NaCN Consumed (kg/tonne-feed) NS201 (CN on Gravity Tails) NS202 (CN on Float NS103 Con) NS203 (CN on Float NS104 Con)

10 Project MS1450 Lake Victoria Mining 3.4 GRAVITY + FLOTATION The flow sheet of the gravity + flotation test work is presented in Figure 2. Figure 2: Flow Sheet Diagram for Gravity + Flotation Test Work The overall gravity and flotation gold grades and recoveries are presented in Table VIII and Table IX. Table VIII: Test NS102 + NS103 Gravity + Flotation Products Weight Assay (g/t) Distribution (%) (g) (%) Au Au Pan Concentrate Pan Tail L40 Concentrate Pan Concentrate Pan Tail L40 Concentrate Pan Concentrate , Pan Tail L40 Concentrate Total L40 Concentrate Float Con Total Concentrate Tails 9, Calculated Head 9, Assayed Head

11 Project MS1450 Lake Victoria Mining Table IX: Test NS102 + NS104 Gravity + Flotation (w/ Na 2 SiO 3 Addition) Products Weight Assay (g/t) Distribution (%) (g) (%) Au Au Pan Concentrate Pan Tail L40 Concentrate Pan Concentrate Pan Tail L40 Concentrate Pan Concentrate , Pan Tail L40 Concentrate Total L40 Concentrate Float Con Total Concentrate Tails 9, Calculated Head 9, Assayed Head 9.80 The overall gravity and flotation test achieved overall gold recoveries that were very similar at 85.2% and 85.6% for Tests NS103 and NS104 respectively. The final tail grades from gravity + flotation tests were 1.41 g/t Au and 1.39 g/t Au respectively. 10

12 Project MS1450 Lake Victoria Mining 3.5 GRAVITY + CYANIDTION The test procedure for gravity + cyanidation is illustrated in Figure 3. Figure 3: Flow Sheet Diagram for Gravity + Flotation + Cyanidation Test Work Feed µm Gravity Test (NS102) Cyanidation Test (NS201) Grind 8 min to 295 µm Pan Tail 1 Grind 36 min to 71 µm Gravity Tails ( ~300 g split for cyanidation test) Cyanidation Cyanidation Residue Pan Con 1 Pan Tail 2 Pan Con 2 Pan Con 3 Pan Tail 3 Cyanidation Leach Solution The overall gravity + cyanidation gold grades and recoveries are presented in Table X. Table X: Test NS102 + NS201 Gravity + Cyanidation Recovery Au Au Assay Leach Overall (g/t or ppm) (dist %) (dist %) Gravity Con CN Solution Total Recovery CN Residue The overall gravity and cyanide leach test achieved an overall gold recovery of 95.5% with a final tail grade of 0.46 g/t Au. 11

13 Project MS1450 Lake Victoria Mining 3.6 GRAVITY + FLOTATION + CYANIDE LEACHING ON THE FLOTATION CONCENTRATE The test procedure for gravity + flotation + cyanide leaching of the flotation concentrate is illustrated in Figure 4. Figure 4: Flow Sheet Diagram for Gravity + Cyanidation Test Work Feed µm Gravity Test (NS102) Flotation Test (NS103 & NS104) Grind 8 min to 295 µm Pan Tail 1 Grind 36 min to 71 µm Gravity Tails ( ~4 kg split for each flotation test) Float Float Tails Pan Con 1 Pan Con 2 Pan Tail 2 Pan Tail 3 Float Con ( ~75 g split for each cyanidation test) Pan Con 3 Cyanidation Cyanidation Residue Cyanidation Leach Solution Cyanidation Test (NS202 & NS203) The overall gravity + flotation + cyanidation gold grades and recoveries are presented in Table XI and Table XII. Table XI: Test NS102 + NS103 + NS202 Gravity + Flotation + Cyanidation of Float Concentrate Au Au Assay Leach Overall (g/t or ppm) (dist %) (dist %) Gravity Con Float Con CN Solution Total Recovery Float Tail CN Residue

14 Project MS1450 Lake Victoria Mining Table XII: Test NS102 + NS104 + NS203 Gravity + Flotation (Na 2 SiO 3 Addition) + Cyanidation of Float Concentrate Au Au Assay Leach Overall (g/t or ppm) (dist %) (dist %) Gravity Con Float Con CN Solution Total Recovery Float Tail CN Residue The overall gravity + flotation + cyanide leaching of float concentrate test achieved overall gold recoveries of 84.0% and 84.2% for the two float tests (NS103 and NS104) respectively. The final tail grades from gravity + flotation + cyanidation were 1.41 g/t Au and 1.39 g/t Au respectively. The tail grades of the flotation concentrates after cyanidation were 4.07 g/t Au and 5.12 g/t Au. 13

15 Project MS1450 Lake Victoria Mining 4.0 SUMMARY The gold head grades of the Lake Victoria sample are summarized below: Assayed head grade: Calculated Grade from Gravity Test: 9.90 g/t Au 9.44 g/t Au The results of the metallurgical test work completed on the Lake Victoria sample are presented in Table XIII below. Table XIII: Lake Victoria Test Work Summary Test Type Test Number Au Recovery (%) Gravity (3-Passes) NS Tail Grade (g/t Au) Gravity + Flotation NS102 + NS Gravity + Flotation NS102 + NS Gravity + Cyanidation on Gravity Tails NS102 + NS Gravity + Flotation + Cyanidation of Float Cons NS102 + NS103 + NS (Flotation Tails) Gravity + Flotation + Cyanidation of Float Cons NS102 + NS104 + NS (Flotation Tails) The Lake Victoria sample had a gravity recoverable gold content of 60.6% at a final grind size of 71 microns. Cyanide leach on the flotation concentrates recovered an average of 94.4% of the gold. Most of the gold was recovered within 3 hours but contained a slightly high tail grade of 4.07 g/t Au and 5.12 g/t Au. The combined gravity + flotation test work achieved an average overall gold recovery of 85.4%. The average final tail grade from gravity + flotation was 1.40 g/t Au. The combined gravity + cyanidation of gravity tails recovery achieved the best results with an overall gold recovery of 95.5% and a final tail grade of 0.46 g/t Au. Most of the gold was leached within 24 hours. The average overall gravity + flotation + cyanidation of flotation concentrate recoveries for gold was 84.1%. 14

16 Project MS1450 Lake Victoria Mining APPENDICES 15

17 Appendix A Overall Flow Sheet 1) Gravity + Cyanide Leach on Gravity Tails Result (NS102 + NS201) 2) Gravity + Flotation + CN on Float Con (NS102 + NS103 + NS202) 3) Gravity + Flotation + CN on Float Con (NS102 + NS104 + NS203) 101B Street, Langley, British Columbia tel: fax:

18 Client: Lake Victoria Test: NS102 + NS201 (Gravity + CN) Sample: Lake Victoria Tanzania GRAVITY + CYANIDE TEST REPORT Date: 07-Mar-13 Project: MS1450 Gravity Products Weight Assay Distribution (%) (g) (%) Au Au Total Concentrate Total Tails 9, Calculated Head 9, Assayed Head 9.80 Au Au Assay Leach Overall (g/t or ppm) (dist %) (dist %) Gravity Con CN Solution Total Rec CN Residue Feed Screen at 14 mesh (1,295 µm) Grind 8 min to 295 µm Grind 36 min to 71 µm L40 Tails Gravity Concentrate Au (g/t) Au (dist%) 60.6 CN Leach CN Residue Au (g/t) 0.46 Au (dist%) 4.5 CN Solution Au (g/t) 1.18 Au (dist%) 34.8

19 GRAVITY+FLOAT+CN TEST REPORT Client: Lake Victoria Test: NS102 + NS103 + NS202 Sample: Lake Victoria Tanzania Date: 07-Mar-13 Project: MS1450 Products Weight Assay (g/t) Distribution (%) (g) (%) Au Au Total L40 Concentrate Float Concentrate Total Concentrate Total Concentrate w/ CN 84.0 Float Tail 9, Calculated Head 9, Assayed Head 9.80 Feed (crushed to 1,870 µm) Falcon with Intermediate grind to 71 µm Tails Float Float Tail Residue Tails Au (g/t) 1.41 Con Con Au (dist%) 14.8 Gravity Con Au (g/t) Au (dist%) 63.4 CN Leach Float Con CN Res. Au (g/t) 4.07 Au (dist%) 1.2 Float Con CN Sol'n Au Au Au (g/t) Assay Leach Overall Au (dist%) 20.6 (g/t or ppm) (dist %) (dist %) Gravity Con Float Con CN Solution Total Rec Float Tail CN Residue

20 GRAVITY+FLOAT+CN TEST REPORT Client: Lake Victoria Test: NS102 + NS104 + NS203 Sample: Lake Victoria Tanzania Date: 08-Mar-13 Project: MS1450 Products Weight Assay (g/t) Distribution (%) (g) (%) Au Au Total L40 Concentrate Float Concentrate Total Concentrate Total Concentrate w/ CN 84.2 Float Tail 9, Calculated Head 9, Assayed Head 9.80 Feed (crushed to 1,870 µm) Falcon with Intermediate grind to 71 µm Tails Float Float Tail Residue Tails Au (g/t) 1.39 Con Con Au (dist%) 14.4 Gravity Con Au (g/t) Au (dist%) 62.5 CN Leach Float Con CN Res. Au (g/t) 5.12 Au (dist%) 1.3 Float Con CN Sol'n Au Au Au (g/t) Assay Leach Overall Au (dist%) 21.7 (g/t or ppm) (dist %) (dist %) Gravity Con Float Con CN Solution Total Rec Float Tail CN Residue

21 Appendix B Gravity Concentration 1) Gravity Results (NS102) 2) PSA of feed (NS101a) 3) PSA, ground after first stage (NS101b) 4) PSA, ground after second stage (NS101c) 101B Street, Langley, British Columbia tel: fax:

22 Metal Recovery (%) GRAVITY CONCENTRATION TEST REPORT Client: Lake Victoria Test: NS102 Sample: Lake Victoria Tanzania Date: 26-Feb-13 Project: MS1450 Objective: To determine the combined gravity-flotation recoveries Products Weight Assay (g/t) Distribution (%) (g) (%) Au Au Pan Concentrate Pan Tail L40 Concentrate Pan Concentrate Pan Tail L40 Concentrate Pan Concentrate , Pan Tail L40 Concentrate Total L40 Concentrate L40 Tails 9, Calculated Head 9, Assayed Head 9.80 Feed µm Grind 8 min to 295 µm Grind 36 min to 71 µm Falcon Test Conditions Pulp Density: 25% Bowl Hole Size: 1/32" Fluid'n Pressure: 3 psi G-Force: 150 g Speed: 55.3 Hz Pan Tail 1 L40 Tails Pan Con 1 Pan Tail 2 Pan Con 2 Pan Tail 3 Pan Con Mass To Concentrate (%)

23 Cum. Passing (%) Cum. Pass. (%) PARTICLE SIZE ANALYSIS Client: Lake Victoria Date: 04-Mar-13 Test: NS101a Initial Feed PSA Project: MS1450 Sample: Lake Victoria Tanzania (As Received) Objective: To determine the initial particle size distribution of the feed material (as received) Rosin-Rammler Model Sieve Size Weight Cummulative (%) Size Passing US Mesh Microns (g) (%) Retained Passing (um) P (%) 1, , , , Linear Interpolation Size Passing (um) P (%) , Undersize TOTAL: ,000 Particle Size (um) ,000 10,000 Particle Size (mm)

24 Cum. Passing (%) Cum. Pass. (%) PARTICLE SIZE ANALYSIS Client: Lake Victoria Date: 06-Mar-13 Test: NS101b Stage 2 Grind Project: MS1450 Sample: Lake Victoria Tanzania (As Received) Objective: To determine the particle size distribution of the gravity tailings before the second stage Grind Time: 8 minutes Rosin-Rammler Model Sieve Size Weight Cummulative (%) Size Passing US Mesh Microns (g) (%) Retained Passing (um) P (%) , , , Linear Interpolation Size Passing (um) P (%) Undersize TOTAL: ,000 Particle Size (um) ,000 10,000 Particle Size (mm)

25 Cum. Passing (%) Cum. Pass. (%) PARTICLE SIZE ANALYSIS Client: Lake Victoria Date: Mar. 08, 2013 Test: NS101c Stage 3 Grind Project: MS1450 Sample: Lake Victoria Tanzania (As Received) Objective: To determine the particle size distribution of the gravity tailings before the third stage (flotation feed) Additional Grind Time: 36 minutes Rosin-Rammler Model Sieve Size Weight Cummulative (%) Size Passing US Mesh Microns (g) (%) Retained Passing (um) P (%) , , , Linear Interpolation Size Passing (um) P (%) Undersize TOTAL: ,000 Particle Size (um) ,000 10,000 Particle Size (mm)

26 Appendix C Falcon & Float Results 1 Gravity+Float Result (NS102 + NS103) 2 Float of Gravity Tails (NS103) 3 Gravity+Float Result (NS102 + NS104) 4 Float of Gravity Tails (NS104) 101B Street, Langley, British Columbia tel: fax:

27 GRAVITY-FLOAT TEST REPORT Client: Lake Victoria Test: NS102 + NS103 Sample: Lake Victoria Tanzania Date: 07-Mar-13 Project: MS1450 Objective: To determine the combined gravity-flotation recoveries Products Weight Assay (g/t) Distribution (%) (g) (%) Au Au Pan Concentrate Pan Tail L40 Concentrate Pan Concentrate Pan Tail L40 Concentrate Pan Concentrate , Pan Tail L40 Concentrate Total L40 Concentrate Float Con Total Concentrate Tails 9, Calculated Head 9, Assayed Head 9.80 Feed µm Grind 8 min to 295 µm Falcon Test Conditions Pulp Density: 25% Bowl Hole Size: 1/32" Fluid'n Pressure: 3 psi G-Force: 150 g Speed: 55.3 Hz Grind 36 min to 71 µm Pan Tail 1 Float Float Tails Pan Con 1 Pan Con 2 Pan Tail 2 Pan Tail 3 Pan Con 3 Float Con

28 FLOTATION TEST REPORT Client: Lake Victoria Test: NS103 Sample: Lake Victoria Tanzania NS102 Tails ground to 71 µm Date: 07-Mar-13 Project: MS1450 Objective: To determine the flotation recoveries on the gravity tailings Pulp Density 31.3% Float Cell 9 litres Speed 1,200 RPM Products Weight Assay (g/t) Distribution (%) (g) (%) Au Ag S (%) Au Ag S Total Flotation Con * Tails 3, < Calculated Head 3, NS102 Gravity Tails *Back-calculated assay grade from cyanidation (Insufficient sample for assay) Time Reagents added, grams per tonne Time (minutes) Stage (min) Na2SiO3 CuSO4 PAX MIBC TF250 Cond. Float ph Initial 0 Re-pulp 0 Conditoner 0 Con Con Con Con Con Con Con Total

29 GRAVITY-FLOAT TEST REPORT Client: Lake Victoria Test: NS102 + NS104 Sample: Lake Victoria Tanzania Date: 08-Mar-13 Project: MS1450 Objective: To determine the combined gravity-flotation recoveries Products Weight Assay (g/t) Distribution (%) (g) (%) Au Au Pan Concentrate Pan Tail L40 Concentrate Pan Concentrate Pan Tail L40 Concentrate Pan Concentrate , Pan Tail L40 Concentrate Total L40 Concentrate Float Con Total Concentrate Tails 9, Calculated Head 9, Assayed Head 9.80 Feed µm Grind 8 min to 295 µm Falcon Test Conditions Pulp Density: 25% Bowl Hole Size: 1/32" Fluid'n Pressure: 3 psi G-Force: 150 g Speed: 55.3 Hz Grind 36 min to 71 µm Pan Tail 1 Float Float Tails Pan Con 1 Pan Con 2 Pan Tail 2 Pan Tail 3 Pan Con 3 Float Con

30 FLOTATION TEST REPORT Client: Lake Victoria Test: NS104 Sample: Lake Victoria Tanzania NS102 Tails ground to 71 µm Date: 08-Mar-13 Project: MS1450 Objective: To determine the flotation recoveries on the gravity tailings Pulp Density 32.2% Float Cell 9 litres Speed 1,200 RPM Products Weight Assay (g/t) Distribution (%) (g) (%) Au Ag S (%) Au Ag S Total Flotation Con Tails 3, < Calculated Head 3, NS102 Gravity Tails Time Reagents added, grams per tonne Time (minutes) Stage (min) Na2SiO3 CuSO4 PAX MIBC TF250 Cond. Float ph Initial Re-pulp 0 Conditoner Con Con Con Con Con Con Con Total

31 Appendix D Cyanide Leach Test 1) CN Leach on Gravity Tails (NS201) 2) CN Leach on NS103 Flotation Con (NS202) 3) CN Leach on NS104 Flotation Con (NS203) 101B Street, Langley, British Columbia tel: fax:

32 Recovery (%) CYANIDATION TEST REPORT Client: Lake Victoria Test: NS201 Sample: Lake Victoria NS102 Gravity Tails Date: 12-Mar-13 Project: MS1450 Products / Time Sol. Wt. Assay (ppm) Distribution (%) (g) Au Au 1 hour #DIV/0! #DIV/0! 6 hours #DIV/0! #DIV/0! 24 hours #DIV/0! #DIV/0! 48 hours #DIV/0! #DIV/0! Residue #DIV/0! #DIV/0! Calculated Head #DIV/0! #DIV/0! NS102 Gravity Tails Time (hours) Au Time ph Lime (10%) NaCN DO (hours) (g) added (kg/t) [g/l] (g) added (kg/t-solids) (mg/l) Test Conditions Initial Solids: g Final Solids: g Iniitial Solution: g %wt loss : 1.12 % Solids: 25 % CN Consumption : 0.70 kg/t solids Initial NaCN: 1.0 g/l Target ph: 10.5 PbNO3 Addition: g total Test Duration: 48 hours NS102 - NS201 Falcon CN (Overall) - CN Mass Balance

33 Recovery (%) CYANIDATION TEST REPORT Client: Lake Victoria Test: NS202 Sample: Lake Victoria NS103 Float Con Date: 12-Mar-13 Project: MS1450 Products / Time Sol. Wt. Assay (ppm) Distribution (%) (g) Au 0 Au 0 1 hour #DIV/0! 3 hours #DIV/0! 6 hours #DIV/0! 24 hours #DIV/0! Residue #DIV/0! Calculated Head #DIV/0! NS103 Float Con Time (hours) Au Time ph Lime (10%) NaCN DO (hours) (g) added (kg/t) [g/l] (g) added (kg/t-solids) (mg/l) Test Conditions Initial Solids: 76.4 g Final Solids: 75.2 g Iniitial Solution: g %wt loss : 1.57 % Solids: 25 % CN Consumption : kg/t solids Initial NaCN: 20.0 g/l Target ph: 10.5 PbNO3 Addition: g total Test Duration: 24 hours NS , NS202 Falcon Float CN (Overall) - CN Mass Balance

34 Recovery (%) CYANIDATION TEST REPORT Client: Lake Victoria Test: NS203 Sample: Lake Victoria NS104 Float Con Date: 12-Mar-13 Project: MS1450 Products / Time Sol. Wt. Assay (ppm) Distribution (%) (g) Au Au 1 hour #DIV/0! 3 hours #DIV/0! 6 hours #DIV/0! 24 hours #DIV/0! Residue #DIV/0! Calculated Head #DIV/0! NS104 Float Con Time (hours) Au Time ph Lime (10%) NaCN DO (hours) (g) added (kg/t) [g/l] (g) added (kg/t-solids) (mg/l) Test Conditions Initial Solids: 68.7 g Final Solids: 67.3 g Iniitial Solution: g %wt loss : 2.04 % Solids: 25 % CN Consumption : kg/t solids Initial NaCN: 20.0 g/l Target ph: 10.5 PbNO3 Addition: g total Test Duration: 24 hours NS , NS203 Falcon Float CN (Overall) - CN Mass Balance

35 Appendix E Assay Summary Lake Victoria Mining a) Test NS103 - Flotation on Gravity Tails b) Test NS104 - Flotation on Gravity Tails c) Gravity Assays d) Cyanidation Assays 101B St Langley, BC CANADA V1M 4A3 tel: fax:

36 MS1450: Float NS103 Sample Assay Summary F.A LECO ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP Sample Sample Au S Ag Al As B Ba Be Bi Ca Cd Ce Co Cr Cu Fe Ga Hg In K La Li Mg Mn Name Description ppm % ppm % ppm ppm ppm ppm ppm % ppm ppm ppm ppm ppm % ppm ppm ppm % ppm ppm % ppm Head Assay <1 <5 51 < < <5 1 < < Total Float Con *NSS <5 151 < < , <5 2 < , Float Tail Cut < <1 <5 36 < < <5 <1 < < Float Tail Cut < <1 <5 37 < < , <5 <1 < < ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP Sample Sample Mo Na Ni P Pb Rb S Sb Sc Se Sn Sr Ta Te Th Ti Tl U V W Y Zn Zr Name Description ppm % ppm ppm ppm ppm % ppm ppm ppm ppm ppm ppm ppm ppm % ppm ppm ppm ppm ppm ppm ppm Head Assay < < <1 <0.5 <10 <5 5.2 <10 <10 <5 <0.01 <5 < <1 5.3 < Total Float Con , < <1 <0.5 < <10 52 <5 <0.01 < < Float Tail Cut 1 < <10 <0.005 <1 <0.5 <10 <5 4.5 <10 <10 <5 <0.01 <5 < <1 3.4 < Float Tail Cut 2 <0.5 < <10 <0.005 <1 <0.5 <10 <5 3.8 <10 <10 <5 <0.01 <5 < <1 3.3 <5 *NSS - Assay was not successful

37 MS1450: Float NS104 Sample Assay Summary F.A LECO ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP Sample Sample Au S Ag Al As B Ba Be Bi Ca Cd Ce Co Cr Cu Fe Ga Hg In K La Li Mg Mn Name Description ppm % ppm % ppm ppm ppm ppm ppm % ppm ppm ppm ppm ppm % ppm ppm ppm % ppm ppm % ppm Head Assay <1 <5 51 < < <5 1 < < Total Float Con <5 145 < < , < < , Float Tail Cut < <1 <5 34 < < , <5 1 < < Float Tail Cut < <1 <5 33 < < , <5 2 < <1 <1 < ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP Sample Sample Mo Na Ni P Pb Rb S Sb Sc Se Sn Sr Ta Te Th Ti Tl U V W Y Zn Zr Name Description ppm % ppm ppm ppm ppm % ppm ppm ppm ppm ppm ppm ppm ppm % ppm ppm ppm ppm ppm ppm ppm Head Assay < < <1 <0.5 <10 <5 5.2 <10 <10 <5 <0.01 <5 < <1 5.3 < Total Float Con , < <1 <0.5 < <10 55 <5 <0.01 < < Float Tail Cut 1 <0.5 < <10 <0.005 <1 <0.5 <10 <5 2.9 <10 <10 <5 <0.01 <5 < <1 2.8 < Float Tail Cut 2 <0.5 < <10 <0.005 <1 <0.5 <10 <5 2.7 <10 <10 <5 <0.01 <5 < <1 2.6 <5

38 MS1450: Gravity Recovery Sample Assay Summary (NS102) F.A ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP Sample Sample Au Ag Al As B Ba Be Bi Ca Cd Ce Co Cr Cu Fe Ga Hg In K La Li Mg Mn Name Description ppm ppm % ppm ppm ppm ppm ppm % ppm ppm ppm ppm ppm % ppm ppm ppm % ppm ppm % ppm Head Assay <1 <5 51 < < <5 1 < < Gravity Tail Cut <1 <5 55 < < , <5 <1 < < Gravity Tail Cut <1 <5 42 < < , <5 1 < < ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP Sample Sample Mo Na Ni P Pb Rb S Sb Sc Se Sn Sr Ta Te Th Ti Tl U V W Y Zn Zr Name Description ppm % ppm ppm ppm ppm % ppm ppm ppm ppm ppm ppm ppm ppm % ppm ppm ppm ppm ppm ppm ppm Head Assay < < <1 <0.5 <10 <5 5.2 <10 <10 <5 <0.01 <5 < <1 5.3 < Gravity Tail Cut 1 < < <1 <0.5 <10 <5 5.5 <10 11 <5 <0.01 <5 < < < Gravity Tail Cut 2 <0.5 < < <1 <0.5 <10 <5 3.8 <10 11 <5 <0.01 <5 < <1 6.4 <5

39 MS1450: Cyanidation Sample Assay Summary F.A ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP Sample Sample Au Ag Al As B Ba Be Bi Ca Cd Ce Co Cr Cu Fe Ga Hg In K La Li Mg Mn Name Description ppm ppm % ppm ppm ppm ppm ppm % ppm ppm ppm ppm ppm % ppm ppm ppm % ppm ppm % ppm Head Assay <1 <5 51 < < <5 1 < < NS201 CN Residue <5 43 < < <5 <1 < < NS202 CN Residue <5 154 < < <5 2 < < , NS203 CN Residue <5 106 < < <5 2 < < ,130 ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP ICP Sample Sample Mo Na Ni P Pb Rb S Sb Sc Se Sn Sr Ta Te Th Ti Tl U V W Y Zn Zr Name Description ppm % ppm ppm ppm ppm % ppm ppm ppm ppm ppm ppm ppm ppm % ppm ppm ppm ppm ppm ppm ppm Head Assay < < <1 <0.5 <10 <5 5.2 <10 <10 <5 <0.01 <5 < <1 5.3 < NS201 CN Residue < <1 <0.5 <10 <5 2.3 <10 <10 <5 <0.01 <5 < <1 7.9 < NS202 CN Residue , < < <10 41 <5 <0.01 < < NS203 CN Residue , < < <10 38 <5 <0.01 < <5