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Advanced Exploration
The Hycroft development project involves reopening
the Brimstone oxide open pit mine which has been on a care and
maintenance program since 1998. The plan will involve the mining
and processing of oxide ore with the heap leach extraction process.
Gold and silver will be produced by utilizing a “run of mine” heap leach
process and a Merrill Crowe gold recovery plant. Based upon
historic gold recovery of Brimstone ores, gold recovery is estimated to
average 56.6%.
Historically, gold mineralization at Brimstone was
thought to be limited to the oxide cap of a large sulfide gold and
silver system. Allied Nevada has completed exploration drilling
that has shown a portion of the oxide cap has extensive sulfide gold and
silver mineralization lying beneath. The thickness of the sulfide
averages approximately 400 feet; the strike length of the gold and
silver sulfide mineralization is approximately 6,000 feet.
Geology
The Hycroft Mine is located on the western flank of
the Kamma Mountains. The style of mineralization is of Tertiary to
Recent-age along major structural zones in a volcanic host rock. The
volcanics are mainly acidic to intermediate tuffs, flows and coarse
volcaniclastic rocks. The volcanic rocks have been block-faulted by
dominant north-trending structures, which have affected the distribution
of alteration and mineralization. The Central Fault and East Fault
control the distribution of mineralization and subsequent oxidation. A
post-mineral range-front fault separates the ore deposit from the
adjacent Pleistocene Lahontan Lake sediments in the Black Rock Desert.
The geological events have created a physical setting ideally suited to
an open-pit, heap leach and possibly sulfide mining operation at the
Hycroft Mine.
|
Tons |
Grade |
Proven &
Probable Ounces |
Measured & Indicated
Ounces |
Inferred Ounces |
| Hycroft |
|
|
|
|
|
| Proven & Probable |
73,159 |
0.016 |
1,143,178 |
|
|
| Measured & Indicated |
68,175 |
0.016 |
|
841,849 |
|
| Inferred |
379,604 |
0.016 |
|
|
6,037,167 |
| Wildcat |
|
|
|
|
|
| Measured & Indicated |
38,108 |
0.018 |
|
686,000 |
|
| Inferred |
28,355 |
0.015 |
|
|
425,000 |
| Maverick |
|
|
|
|
|
| Measured & Indicated |
69,630 |
0.010 |
|
696,000 |
|
| Inferred |
85,550 |
0.008 |
|
|
684,000 |
| Mountain View |
|
|
|
|
|
| Measured & Indicated |
23,219 |
0.013 |
|
303,000 |
|
| Inferred |
4,466 |
0.039 |
|
|
175,000 |
| Hasbrouck / Three Hills |
|
|
|
|
|
| Measured & Indicated |
26,036 |
0.023 |
|
599,000 |
|
| Inferred |
8,200 |
0.021 |
|
|
172,000 |
|
|
|
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