Overview
| Status | Care and Maintenance |
| Mine Type | Underground |
| Commodities |
|
| Mining Method |
- Overhand stoping
- Mechanized Cut & Fill
- Paste backfill
|
| Processing |
|
| Mine Life | 12 years (as of Jan 1, 2013) |
The mine was placed on temporary care and maintenance in February 2019. |
Source:
p. 109
| Company | Interest | Ownership |
|
Hochschild Mining Plc.
|
100 %
|
Indirect
|
|
Compañía Minera Ares S.A.C.
(operator)
|
100 %
|
Indirect
|
Hochschild Mining Plc. indirectly owns 100% interest in the Arcata mine through its wholly owned subsidiaries Compañía Minera Ares S.A.C. and Compañía Minera Arcata S.A.
Deposit Type
- Epithermal
- Vein / narrow vein
Summary:
The Arcata mine is conformed by vein systems where the epithermal vein deposits are of an intermediate sulphidation type with predominant silver values and variable quantities of gold and base metals. The main structures at Arcata are Mariana NE, Blanca, Amparo, Ramal Leslie, Alexia and Marion. The known structures at Arcata extend over 29 kilometres.
Mining Methods
- Overhand stoping
- Mechanized Cut & Fill
- Paste backfill
Summary:
The veins are mined by conventional and mechanised (trackless) cut-and-fill breast or overhand stoping methods utilising timber support.
| Crusher / Mill Type | Model | Size | Power | Quantity |
|
SAG mill
|
|
|
|
|
|
Ball mill
|
|
|
|
|
Flow Sheet:
Summary:
The plant at Arcata produced silver/gold bulk concentrate by flotation.
Recoveries & Grades:
| Commodity | Parameter | 2019 | 2018 | 2017 | 2016 | 2015 | 2014 |
|
Silver
|
Head Grade, g/t
| 298 | 321 | 308 | 337 | 323 | 286 |
|
Gold
|
Head Grade, g/t
| 0.94 | 0.99 | 1.07 | 1.24 | 0.99 | 0.85 |
Production:
| Commodity | Units | 2019 | 2018 | 2017 | 2016 | 2015 | 2014 |
|
Silver
|
koz
| ...... | 3,416 | 4,391 | 6,343 | 5,613 | 5,827 |
|
Gold
|
koz
| ...... | ...... | ...... | ...... | ...... | ...... |
|
Silver Equivalent
|
koz
| ...... | ...... | ...... | ...... | ...... | ...... |
|
Gold Equivalent
|
koz
| ...... | ...... | ...... | ...... | ...... | |
All production numbers are expressed as metal in concentrate.
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Operational Metrics:
| Metrics | 2019 | 2018 | 2017 | 2016 | 2015 | 2014 |
|
Ore tonnes mined
| ...... | 373,106 t | 499,385 t | 677,309 t | 648,051 t | 701,947 t |
|
Daily processing capacity
| ...... | 2,500 t | 2,000 t | 2,500 t | | |
|
Daily processing rate
| ...... | | 1,500 t | 1,750 t | | |
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Reserves at December 31, 2018:
| Category | Tonnage | Commodity | Grade | Contained Metal |
|
Measured
|
834,000 t
|
Silver
|
438 g/t
|
11.7 M oz
|
|
Measured
|
834,000 t
|
Gold
|
1.35 g/t
|
36.1 koz
|
|
Measured
|
834,000 t
|
Silver Equivalent
|
547 g/t
|
14.7 M oz
|
|
Indicated
|
1,304,000 t
|
Silver
|
411 g/t
|
17.2 M oz
|
|
Indicated
|
1,304,000 t
|
Gold
|
1.36 g/t
|
56.9 koz
|
|
Indicated
|
1,304,000 t
|
Silver Equivalent
|
521 g/t
|
21.8 M oz
|
|
Measured & Indicated
|
2,138,000 t
|
Silver
|
421 g/t
|
29 M oz
|
|
Measured & Indicated
|
2,138,000 t
|
Gold
|
1.35 g/t
|
93 koz
|
|
Measured & Indicated
|
2,138,000 t
|
Silver Equivalent
|
531 g/t
|
36.5 M oz
|
|
Inferred
|
3,533,000 t
|
Silver
|
371 g/t
|
42.1 M oz
|
|
Inferred
|
3,533,000 t
|
Gold
|
1.26 g/t
|
142.6 koz
|
|
Inferred
|
3,533,000 t
|
Silver Equivalent
|
472 g/t
|
53.6 M oz
|
Commodity Production Costs:
| | Commodity | Units | 2019 | 2018 | 2017 | 2016 | 2015 | 2014 |
|
Total cash costs
|
Silver
|
USD
|
......
|
16.9 / oz
|
14.5 / oz
|
11 / oz
|
11.7 / oz
|
12.6 / oz
|
|
All-in sustaining costs (AISC)
|
Silver Equivalent
|
USD
|
......
|
19.6 / oz
|
18.4 / oz
|
13.7 / oz
|
14.3 / oz
|
17.7 / oz
|
|
All-in sustaining costs (AISC)
|
Gold Equivalent
|
USD
|
......
|
1,448 / oz
|
1,362 / oz
|
1,014 / oz
|
|
|
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Operating Costs:
| | Units | 2019 | 2018 | 2017 | 2016 | 2015 | 2014 |
|
Total operating costs ($/t milled)
|
USD
| 182.2 | 167.7 | 124.8 | 101.1 | 109.1 | 89.1 |
Financials:
| | Units | 2019 | 2018 | 2017 | 2016 | 2015 | 2014 |
|
Capital expenditures
|
M USD
| ...... | 0.53 | 17.6 |
20.8
|
14.6
|
28.9
|
|
Revenue
|
M USD
| ...... | 56.6 | 77.9 |
117.36
|
107.42
|
106.06
|
|
Gross profit
|
M USD
| ...... | -6.32 | -2.28 |
24.9
|
-0.38
|
|
|
Pre-tax Income
|
M USD
| ...... | -7.31 | -4.21 |
22.9
|
-1.34
|
|
|
After-tax Income
|
M USD
| ...... | -7.31 | -4.21 |
22.9
|
-1.34
|
-1.34
|
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Corporate Filings & Presentations:
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Aerial view:
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