Overview
Status | Closing / Closed |
Mine Type | Underground |
Commodities |
|
Mining Method |
- Mechanized Cut & Fill
- Longhole stoping
|
Processing |
- Gravity separation
- Agitated tank (VAT) leaching
- Counter current decantation (CCD)
- Merrill–Crowe
- Cyanide (reagent)
|
Mine Life | 2017 |
The Company's closure of the Marlin mine at the end of May, 2017. |
Source:
Summary:
The deposit is classic low-sulfidation, quartz-calcite-adularia veins and stockwork host gold-silver mineralization in association with late-stage andesite dike swarms. The deposit is along a west-northwest striking normal fault on the eastern flank of the volcanic complex.
Mining Methods
- Mechanized Cut & Fill
- Longhole stoping
Summary:
Marlin has been in production since late 2005, operating as both an open pit and underground mine. Open pit operations ceased in early 2012 as the final, higher-grade portion of the open pit was mined, and the mine is now an underground operation only.
Underground operations employ mechanized cut-and-fill and long hole stoping mining, with underground loading equipment feeding haul trucks that transport the ore to the surface via ramps. Production from underground operations is now roughly 3,200 ore tonnes per day.
Processing
- Gravity separation
- Agitated tank (VAT) leaching
- Counter current decantation (CCD)
- Merrill–Crowe
- Cyanide (reagent)
Source:
Summary:
Ore is processed in a conventional crushing, grinding and milling circuit. Marlin also has a tailing storage facility, a waste rock storage area and various ancillary installations. Since 2012, a Filter Plant was commissioned to dry the tailings from the mill. The dry tailings are being used to backfill the pit.
Marlin’s cyanide circuit consists of a gravity concentrator and intensive cyanidation reactor, grinding thickener, pregnant solution storage tank, cyanide mixing tank, cyanide storage tank, process water storage tank, six leach tanks, five CCD tanks, cyanide recovery thickener and interconnection pipes. The ground ore is processed in tanks by an agitated leach in a cyanide solution. The resulting product is passed through a CCD system. Gold and silver are recovered from solution by a zinc precipitation/Merrill-Crowe system.
Recoveries & Grades:
Commodity | Parameter | 2016 | 2015 | 2014 |
Gold
|
Recovery Rate, %
| 97 | 97 | 97 |
Gold
|
Head Grade, g/t
| 3.65 | 4.12 | 3.11 |
Silver
|
Recovery Rate, %
| 96 | 95 | 93 |
Silver
|
Head Grade, g/t
| 184 | 185 | 126 |
Production:
Commodity | Units | 2016 | 2015 | 2014 | 2013 |
Gold
|
koz
| 115 | 169 | 186 | 202 |
Silver
|
koz
| ......  | ......  | ......  | ......  |
Gold Equivalent
|
koz
| ......  | ......  | ......  | ......  |
All production numbers are expressed as metal in doré.
Operational Metrics:
Metrics | 2016 | 2015 | 2014 | 2013 |
Tonnes milled
| 1,006 kt | 1,310 kt | 1,933,900 t | 1,941,900 t |
Daily processing capacity
| 6,000 t | | | |
Daily milling rate
| | | 5,300 t | 5,320 t |
Reserves at June 30, 2016:
Category | Tonnage | Commodity | Grade | Contained Metal |
Proven
|
0.42 Mt
|
Gold
|
4.08 g/t
|
0.05 M oz
|
Proven
|
0.42 Mt
|
Silver
|
206.45 g/t
|
2.76 M oz
|
Probable
|
0.09 Mt
|
Gold
|
4.18 g/t
|
0.01 M oz
|
Probable
|
0.09 Mt
|
Silver
|
119.03 g/t
|
0.34 M oz
|
Proven & Probable
|
0.5 Mt
|
Gold
|
4.1 g/t
|
0.07 M oz
|
Proven & Probable
|
0.5 Mt
|
Silver
|
191.04 g/t
|
3.1 M oz
|
Measured
|
0.27 Mt
|
Gold
|
4.51 g/t
|
0.04 M oz
|
Measured
|
0.27 Mt
|
Silver
|
193.95 g/t
|
1.66 M oz
|
Indicated
|
0.2 Mt
|
Gold
|
4.6 g/t
|
0.03 M oz
|
Indicated
|
0.2 Mt
|
Silver
|
193.74 g/t
|
1.23 M oz
|
Measured & Indicated
|
0.46 Mt
|
Gold
|
4.55 g/t
|
0.07 M oz
|
Measured & Indicated
|
0.46 Mt
|
Silver
|
193.86 g/t
|
2.89 M oz
|
Inferred
|
0.04 Mt
|
Gold
|
6.68 g/t
|
0.01 M oz
|
Inferred
|
0.04 Mt
|
Silver
|
333.44 g/t
|
0.39 M oz
|
Commodity Production Costs:
| Commodity | Units | 2016 | 2015 | 2014 |
Total cash costs
|
Gold
|
USD
|
977 / oz
|
611 / oz
|
|
Total cash costs
|
Gold
|
USD
|
803 / oz†
|
336 / oz†
|
|
All-in sustaining costs (AISC)
|
Gold
|
USD
|
986 / oz†
|
868 / oz†
|
862 / oz†
|
† Net of By-Product.
Operating Costs:
| Units | 2016 | 2015 | 2014 |
UG mining costs ($/t mined)
|
USD
| 109.12 | 62.2 | 74 |
OP mining costs ($/t mined)
|
USD
| | | |
Processing costs ($/t milled)
|
USD
| ......  | ......  | ......  |
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Financials:
| Units | 2016 | 2015 |
Capital expenditures
|
M USD
|
2
|
64
|
Revenue
|
M USD
|
242
|
312
|
Operating Income
|
M USD
|
-124
|
-407
|
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