Overview
Stage | Construction |
Mine Type | Underground |
Commodities |
|
Mining Method |
- Cut & Fill
- Mechanized inclined panel mining
- Cemented paste backfill
|
Production Start | ... |
Mine Life | 13 years (as of Jan 1, 2016) |
The Sangdong Mine, which was historically one of the largest tungsten mines in the world and one of the few long-life, high-grade tungsten deposits outside of China, was acquired by Almonty in September 2015.
Sangdong Project is a past-producing asset with existing infrastructure. All Project milestones have been achieved and construction is well advanced. |
Source:
p. 4,5
Almonty, through its wholly-owned subsidiary, Woulfe Mining Corp, owns a 100% interest in the Almonty Korea Tungsten Project (Sangdong Mine).
Contractors
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Summary:
The Property contains a tungsten skarn deposit; skarns are contact metasomatic deposits, exploited for tungsten, with accessory molybdenum, copper, tin and zinc.
The tungsten mineralisation of the Sangdong deposit is contained in several tabular, beddingconformable skarns in the Myobong Shale; these skarns have been interpreted as comprising carbonate-bearing horizons that were altered and mineralised by fluids ascending from the underlying Sangdong Granite.
From uppermost to lowermost, these horizons are termed the Hangingwall, Main, and Footwall horizons. Calc-silicate layers from 0.50 – 1.0m in thickness have developed on the upper and lower contacts of the Main and Footwall horizons.
The Hangingwall horizon is located near the upper contact of the Myobong shale and varies in thickness from approximately 5.0 to 30.0m because of the irregular boundary of the shale with the overlying Pungchon Limestone. This zone has a strike length of about 600m and a down-dip extent of about 800m. Above the most highly-altered portion of the Main horizon, the Hangingwall horizon is not tabular, but extends steeply and irregularly into the overlying limestone. The Hangingwall horizon contains diopside, garnet, fluorite, zoisite, quartz, hornblende, wollastonite and up to 50% calcite and although there is some zonal variation in mineral assemblages (diopside-, hornblende- and quartzrich zones) the zonation is not as well- developed as in the underlying Main h ........
Mining Methods
- Cut & Fill
- Mechanized inclined panel mining
- Cemented paste backfill
Summary:
The majority of the ore zones to be mined are relatively shallow dipping, with dips between 20° and 30°, so ore will not naturally flow by gravity on the footwall. In the A-Z Feasibility Study, the methods proposed were inclined panel (“IP”) mining, to be applied in thick orebody areas, with panels that would be mined in different sections; and up-dip panel mining (“UP”), which would be applied in narrow areas with slushers and hand-held drilling equipment.
For this present study, it was decided not to rely on hand-held drilling equipment and slushers. Instead, methods applied would be planned for the use of mechanized mobile diesel powered mining equipment in all areas. Based on this requirement and the latest understanding of the orebody geometry and mining areas, and evaluation of the resources, including in-situ thickness variations, it was decided to apply two proposed mining method Mechanized Inclined Panel mining (“MIP”) and Cut-and-Fill (“CAF”).
The envisaged MIP method involves drifting on apparent dip, so as not to exceed a gradient of 15%, and so allow trackless equipment. The stope development is planned to be symmetrical, with panels being extended both up and down from access galleries.
This method is very flexible, in allowing working upwards or downwards, and conversion to cut-and-fill.
The sequencing of MIP stoping operations will be:
1. Development of level strike drives, the base transport gallery.
2. Ore Drifts will be developed oblique to strike dri ........
Source:
p.184-189
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Flow Sheet:
Summary:
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Pipelines and Water Supply
Source:
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Projected Production:
Commodity | Units | LOM |
WO3
|
mtu
| 2,867,168 |
All production numbers are expressed as WO3 in concentrate.
Operational Metrics:
Metrics | |
Daily ore mining rate
| 1,830 t * |
Daily processing capacity
| 1,920 t * |
Annual ore mining rate
| 640 kt * |
Annual production capacity
| 5,519 t of wo3 concentrate * |
Ore tonnes mined, LOM
| 7,896 kt * |
* According to 2016 study.
Reserves at July 31, 2016:
For Reserves WO3 Cut-offs applied:
0.36% Max Spans <=3m
0.28% Max Spans >3m <=6m
0.23% Max Spans +6m
For Resources cut-off grade is 0.15% WO3.
Reported Reserves and Resources have not changed on May 14, 2021. [2020 AIF, 61-62]
Mineral Resources are reported inclusive of Mineral Reserves.
Category | Tonnage | Commodity | Grade | Contained Metal |
Probable
|
7,896 kt
|
WO3
|
0.45 %
|
3,553,200 mtu
|
Indicated
|
8,029 kt
|
WO3
|
0.51 %
|
4,094,790 mtu
|
Indicated
|
8,029 kt
|
Molybdenum
|
0.06 %
|
|
Inferred
|
50,686 kt
|
WO3
|
0.43 %
|
21,794,980 mtu
|
Inferred
|
50,686 kt
|
Molybdenum
|
0.05 %
|
|
Corporate Filings & Presentations:
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