Mining Technology and Sustainable Development. Water and the Environment

Transcription

1 Mining Technology and Sustainable Development Water and the Environment Capital Market Day June

2 About us FLSmidth is a leading supplier of equipment and services to the global minerals and cement industries FLSmidth supplies everything from single machine units to complete minerals and cement flow sheets including associated services FLSmidth primarily focuses on the following industries: coal, iron ore, fertilizers, copper, gold and cement and has the ambition of being among the leading and preferred suppliers in each of these industries Listed on NASDAQOMX Copenhagen, Denmark Close to 15,000 employees Capital Market Day June

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4 Water scarcity, access rights and costs As water scarcity deepens, political instability grows (The Guardian-March 2017): In Bolivia, Peru and Ecuador disputes over water shortages are part of a wider fight for equal access and shared responsibility Average size concentrator with a capacity 100,000 tpd and a Water Ratio of (Cyclone High Rate Thickener) requires 50-70,000 m3 (50 70 million liter) of water per day Capital Market Day June

5 Many drivers toward filtered tailings Land: Minimizing tailings management facility footprint saving money Footprint is < 50% of a conventional TMF Water reclamation => reduce dependency on external water supply and saving money Water can cost > USD 5/m3 (seawater desalination) Reduction in closure costs at end of mine life reduce liabilities Progressive closure possible Providing a social license to the mine Minimum environmental impact => quicker permitting possible Reduced tailings risk improving safety Avoid / remove water pool and dam prior to failure Capital Market Day June

6 Dry Stack Tailings Synchronizing market demand and solution development Market interest for large scale DST Early adaptors acceptance for large scale DST concepts Market acceptance for large scale DST technology Market demand for large scale DST solutions Development of large filter solutions Testing pilot plant and optimization 1st full-scale pilot & demo plant Commercialisation and market penetration DST flowsheet studies Colossal filter plant development Prototype built Colossal trial operational R&D projects completed and commercialised Smaller traditional sized projects ready to start First Colossal large scale DST commercial operation Demonstration of new R&D projects / improvements in costs Continuous demand for large scale integrated DST project

7 FLSmidth is the one source for tailings solutions Only OEM with complete equipment offering Thickeners - conventional to paste High-rate thickener underflow wt% solids High-density thickener underflow wt% solids Paste thickener underflow wt% underflow Filters - vacuum to high pressure filters Filtered tailings with wt% solids Pumps Hydro-cyclones Material handling - filter discharge and mobile stacking conveyors Systems engineering to tie it all together Understand how the complete flowsheet effects the performance of tailings equipment Grind size and ultra fines vs. tailings dewatering Tailings dewatering vs. conveyability Thickening vs. vacuum filtration vs. pressure filtration lifecycle economics Robust R&D program to develop and commercialise filtered tailings systems Partnering experience and corporate culture Capital Market Day June

8 Why EcoTails? Tailings dams fail at an unacceptable rate Dam failures represent a significant liability to the mining industry A step-change in tailings management is required to address these challenges Water resources are increasingly scarce and expensive The collaborative team of Goldcorp and FLSmidth was created and tasked to provide this step-change

9 Main Focus Areas Throughput and Cost Tailings dewatering and storing throughputs exceeding 100,000 tonnes per day Capital and operating cost less than $2.50 per tonne stored in place To achieve this step-change, innovation was necessary

10 What is EcoTails EcoTails is An efficient, co-mingled dewatered tailings and waste rock operation Blended in transit The resulting co-mingled material is referred to as GeoWaste Major Benefits Include: No tailings dam Lower fresh water use Reduced ARD potential Less risk & Lower costs

11 Example 120ktpd tailings requiring significant airblow of the pressure filter cake to get the cake moisture required for Geotech strength 2x2 filters required = 72 2x4 filters required = 36 Bigger filters required (part of EcoTails) = 16 Fast Filtering (Eliminating Airblow) = 8 filters STEP CHANGE reducing 72 filters to 8 Eliminating airblow increases the cake moisture to wt% as a saturated filter cake. STEP CHANGE GeoWaste Needed to increase Geotech strength

12 What is GeoWaste? HOW DOES IT WORK? Low oxygen diffusion rates Reduced footprint Tailings fill the void space between rock particles to reduce opportunity for oxygen flow Reduced Acid Rock Drainage Reduced Permeability Improved permitting timeline No tailings dam Coarse waste rock particles provide shear strength for physical stability Early or progressive closure Reduced ARD potential The waste rock and tailings are blended in transit using the energy of conveyance for mixing. Improved water recovery Improved geotech strength & permeability

13 GeoWaste Tailings Tailings Failure Risks Typically saturated Low shear strength Physical stability issues Low permeability Anaerobic conditions Waste Rock Waste Rock ARD Risks Typically unsaturated High shear strength Good stability High permeability Aerobic conditions GeoWaste No tailings dam Reduced costs and risks Unsaturated Higher shear strength Good stability Lower permeability Anaerobic conditions

14 EcoTails Flow Sheet Tailings 30% solids 120,000 tpd solids 280,000 tpd water Overall Water Ratio 0.2 m3/tonne Thickener 55% solids 120,000 tpd solids 98,200 tpd water Filtration 82% solids 120,000 tpd solids 26,400 tpd water Conveyor Water Back to Mill 181,800 tpd (65%) Water Back to Mill 71,800 tpd (26%) Water Back to Mill 2,000 tpd (1 %)

15 Achievable Step-Changes Current State Conventional Wet Tailings Facility Generic EcoTails 100,000 tonne per day operation, and a billion tonnes of reserves, the following stepchanges are within reach: Tailings OpEx about $1.5 per tonne Tailings with a rockfill dam CapEx about $1 per tonne OpEx less than $2 per tonne CapEx less than $0.50 per tonne Water ratio of 0.5 to 0.7 m 3 /tonne Tailings dam failure risks. Achieves water ratio of 0.2 m 3 /tonne A geotechnically and geochemically stable GeoWaste

16 Issues and Challenges Co-mingling Co-mingling can increase stacking height from 20m to +/- 50m Thin lift (2m) tails only 5 October

17 Thank You Contact Todd Wisdom Director Tailings Solutions The information contained or referenced in this presentation is confidential and proprietary to FLSmidth and is protected by copyright or trade secret laws. 5 October,