Overview
Stage | Permitting |
Mine Type | Open Pit |
Commodities |
|
Mining Method |
|
Mine Life | 9 years (as of Jan 1, 2016) |
Source:
Contractors
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Deposit Type
- Breccia pipe / Stockwork
- Epithermal
Summary:
Within the Liam Regional Venture Area, the oldest volcanic units are those of the Tacaza Formation which in turn are overlain by the Late Miocene Alpabamba volcanics consisting of bedded, felsic to andesitic tuffs and lavas and associated re-worked units. It is the Alpabamba units which host the Cerro Crespo-Queshca gold-silver mineralization.
Cerro Crespo butte is a high-level, complex, hydrothermal vent system located on the southern side of the maar-like crater and exhibiting several felsic diatreme/brecciation events. At a depth of 150 to 200 m some of these diatreme/breccia zones become narrow, fault-controlled feeder zones.
MINERALIZATION
The Soteco Joint Venture initially identified the Liam area as a zone of high sulphidation type epithermal gold-silver mineralization and in particular that the Cerro Crespo butte could represent a vent related diatreme-type body.
Subsequently Misosa ( Minera del Suroeste S.A.C.) mapped and sampled in detail Cerro Crespo and Queshca and then carried out an initial diamond drilling program at Cerro Crespo. Detailed mapping and sampling in 2002 and 2003 resulted in the collection of 410 channel samples mainly on the top of Cerro Crespo and on its northern and eastern flanks. The mapping identified the various breccia units, while the sampling identified five areas, from northwest to southeast and referred to as Areas A, B, C, D, and E, of gold-silver mineralization with grades ranging from anomalo ........

Summary:
Crespo is a high sulphidation epithermal deposit and will be mined utilising open-pit methods with an average daily production of 6,850 tonnes and a stripping ratio of 1.15:1. Drilling and blasting will be carried out directly by Hochschild with earthworks being developed by contractors.
Flow Sheet:
Summary:

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Projected Production:
Commodity | Units | Avg. Annual | LOM |
Silver
|
M oz
| 1 | 8.8 |
Gold
|
koz
| ......  | ......  |
Gold Equivalent
|
koz
| ......  | ......  |
Silver Equivalent
|
M oz
| ......  | |
All production numbers are expressed as metal in doré.
* According to 2012 study.
Reserves at December 31, 2019:
The Mineral Resources as of December 31, 2021 at Crespo mine are unchanged from December 31, 2019.
Category | Tonnage | Commodity | Grade | Contained Metal |
Measured & Indicated
|
22,509,000 t
|
Silver
|
40 g/t
|
28.8 M oz
|
Measured & Indicated
|
22,509,000 t
|
Gold
|
0.42 g/t
|
301 koz
|
Measured & Indicated
|
22,509,000 t
|
Silver Equivalent
|
74 g/t
|
53.2 M oz
|
Inferred
|
775,000 t
|
Silver
|
46 g/t
|
1.1 M oz
|
Inferred
|
775,000 t
|
Gold
|
0.57 g/t
|
14.2 koz
|
Inferred
|
775,000 t
|
Silver Equivalent
|
92 g/t
|
2.3 M oz
|
Commodity Production Costs:
| Commodity | Units | |
Total cash costs
|
Silver Equivalent
|
USD
|
12.7 / oz * USD
|
Total cash costs
|
Silver
|
USD
|
13 / oz * USD
|
Total cash costs
|
Gold Equivalent
|
USD
|
764 / oz * USD
|
Total cash costs
|
Gold
|
USD
|
754 / oz * USD
|
Assumed price
|
Silver
|
USD
|
23 / oz * USD
|
Assumed price
|
Gold
|
USD
|
1,300 / oz * USD
|
* According to 2012 study / presentation.
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Operating Costs:
| Units | 2022 |
Direct operating costs ($/t milled)
|
USD
| 13.5 * |
* According to 2012 study.
2012 Study Costs and Valuation Metrics :
Metrics | Units | LOM Total |
Initial CapEx
|
$M USD
|
......
|
Total CapEx
|
$M USD
|
......
|
After-tax NPV @ 0%
|
$M USD
|
......
|
After-tax NPV @ 5%
|
$M USD
|
......
|
After-tax NPV @ 8%
|
$M USD
|
......
|
After-tax IRR, %
|
|
......
|
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Corporate Filings & Presentations:
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