Overview
Stage | Permitting |
Mine Type | Open Pit |
Commodities |
|
Mining Method |
|
Processing |
- Heap leach
- Carbon adsorption
- Merrill–Crowe
- Cyanide (reagent)
|
Mine Life | 4 years (as of Jan 1, 2017) |
Latest News | Eros Resources Corp. Closes Private Placement August 13, 2020 |
Summary:
The Bell Mountain property is located within the Fairview Peak caldera, a small Miocene (~19.2 Ma) volcanic center comprised of a thick sequence of rhyolite-dacite flows, flow domes, and pyroclastic rocks. Epithermal low-sulfidation gold-silver mineralization is hosted by calcite and quartz-calcite veins and stockwork associated with pervasive silicification. Veins and hydrothermal alteration are controlled by east northeast trending near-vertical structures and west-northwest cross structures. The precious metal-bearing minerals are electrum, argentite/acanthite, and native silver. To date, four main bodies of gold-silver mineralization (Varga, Spurr, Sphinx and East Ridge) have been defined by drilling. The larger Spurr and Varga zones are situated along the principal NE structural trend (Varga-Spurr fault), the Sphinx zone is controlled by a WNW cross structure (Sphinx fault). The East Ridge zone is controlled by a NE striking structure. The East Ridge Deposit consists of a single east-northeast trending quartz-calcite vein which dips steeply to the south.
Summary:
The mining operation is assumed to be a conventional open pit mine, with drill and blast rock breakage and truck and loader materials handling.
The mine production schedule was based on an average of 5,000 tons / day delivered to the crusher and then placed on the heap leach pad as crushed mineralized material. The pits will be mined sequentially beginning at the Spurr pit near the crusher and progressing easterly to the Varga, Sphinx and East Ridge pits. The production schedule was constrained to produce a constant feed of mineralized material to the crusher and conveyor (or truck) loading onto the heap leach pad. Some stockpiling of higher grade material may be required to balance the crusher feed rate.
Processing
- Heap leach
- Carbon adsorption
- Merrill–Crowe
- Cyanide (reagent)
Source:
Summary:
Based on proximity to surface, average grade and the results from preliminary metallurgical test work the recovery methods anticipated to be most appropriate for the Bell Mountain deposits (Spurr, Varga, Sphinx and East Ridge) would be valley leach, in which multiple lifts of mineralized material are placed on a permanent pad. While the mineralized material has a relatively large silver content (25:1 Ag:Au ratio in some materials), a Merrill-Crowe recovery system might be considered. However, given the much higher Au recoveries (~80%) and the very low Ag recoveries (<15%) carbon adsorption of the precious metals from the leach solution would be suggested for this operation. Heap leaching with carbon adsorption is suggested as the best processing option for all of the mineralized material at Bell Mountain.
Blasted rock is fed to a jaw crusher which will reduce the maximum particle size to 4 inches. Following primary crushing, the mineralized material will be fed to a standar ........

Projected Production:
Commodity | Units | LOM |
Gold
|
oz
| 60,056 |
Silver
|
oz
| ......  |
Operational Metrics:
Metrics | |
Daily mining rate
| ......  |
Waste tonnes, LOM
| ......  |
Ore tonnes mined, LOM
| ......  |
Total tonnes mined, LOM
| ......  |
* According to 2017 study.
Reserves at December 31, 2017:
Category | Tonnage | Commodity | Grade | Contained Metal |
Measured
|
1,103 k tons
|
Gold
|
0.019 oz/ton
|
21,087 oz
|
Measured
|
1,103 k tons
|
Silver
|
0.52 oz/ton
|
573,256 oz
|
Measured
|
1,103 k tons
|
Gold Equivalent
|
0.021 oz/ton
|
22,987 oz
|
Indicated
|
1,826 k tons
|
Gold
|
0.017 oz/ton
|
31,340 oz
|
Indicated
|
1,826 k tons
|
Silver
|
0.44 oz/ton
|
798,074 oz
|
Indicated
|
1,826 k tons
|
Gold Equivalent
|
0.019 oz/ton
|
33,805 oz
|
Measured & Indicated
|
2,929 k tons
|
Gold
|
0.018 oz/ton
|
52,427 oz
|
Measured & Indicated
|
2,929 k tons
|
Silver
|
0.47 oz/ton
|
1,371,330 oz
|
Measured & Indicated
|
2,929 k tons
|
Gold Equivalent
|
0.019 oz/ton
|
56,793 oz
|
Inferred
|
1,978 k tons
|
Gold
|
0.014 oz/ton
|
28,332 oz
|
Inferred
|
1,978 k tons
|
Silver
|
0.43 oz/ton
|
844,804 oz
|
Inferred
|
1,978 k tons
|
Gold Equivalent
|
0.015 oz/ton
|
30,271 oz
|
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