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Advanced Exploration Properties |
HYCROFT MINE
 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.
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