ecru project - rengold · ecru project in cortez area ... hills fault at intersection with crescent...
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R E F I N I N G T H E A R T O F M I N E R A L E X P L O R A T I O N
EcruProject
Location Ecru Project in Cortez area
(~50 Moz Au), Battle Mtn –Eureka Trend
Adjacent to Barrick’s Robertson deposits
Along projection of Cortez Hills fault at intersection with Crescent Valley –Independence Lineament
Regional Bouguer gravity suggests major structural intersection
Carlin-type deposits align along gravity gradients
Gravity
World Class Carlin-type district ~50M oz Au endowment Projection of Cortez Fault aligns
with Ov/Tv contact N of Ecru CVIL forms range front to S of
Ecru Upper plate rocks beneath
shallow alluvial cover Lower plate targets
(after Creel et. al, 2004)
Geology
World Class Carlin-type district ~50M oz Au endowment Projection of Cortez Fault aligns
with Ov/Tv contact N of Ecru CVIL forms range front to S of
Ecru Upper plate rocks beneath
shallow alluvial cover Lower plate targets
(after Creel et. al, 2004)
Geology Detailed Gravity Survey
0 1000 2000 3000 4000 5000
meters
N
CBG 2.50 g/cc Residual Gravity
Project-scale Gravity high suggests uplifted lower plate carbonatesGravity
km
Gravity highs represent lower plate carbonates beneath exposed upper plate rocks and alluvium
Geology and Gravity
km
Gravity highs represent lower plate carbonates beneath exposed upper plate rocks and alluvium
Geology and Gravity
km
Gravity highs represent lower plate carbonates beneath exposed upper plate rocks and alluvium
Geology and Gravity
Leonardson Mapping
Leonardson (2010)
Geology
Geology
Leonardson (2010)
Leonardson (2010)
Projection of Cortez fault coincides with gravity break
High grade drill intercepts (as high as 1 oz Au/t) to W along same gravity high
Leonardson (2010) Pipeline bedrock geology map shows major thrust (Abyss thrust) well out into pediment
Geology and Gravity
Geology and Gravity
Projection of Cortez fault coincides with gravity break
High grade drill intercepts (as high as 1 oz Au/t) to W along same gravity high
Leonardson (2010) Pipeline bedrock geology map shows major thrust (Abyss thrust) well out into pediment
Is the gravity high to the north of Pipeline representative of the Abyss Thrust in the pediment?
Geology and Gravity
Projection of Cortez fault coincides with gravity break
High grade drill intercepts (as high as 1 oz Au/t) to W along same gravity high
Leonardson (2010) Pipeline bedrock geology map shows major thrust (Abyss thrust) well out into pediment
Is the gravity high to the north of Pipeline representative of the Abyss Thrust in the pediment?
Carbonate?
Cross section looking NNW based on projected geology and gravity data Gravity suggests 2000 - 3000 ft to major Carlin-type target However, if carbonate wedge thins to the east, depth to RMT may be less High grade intersected in at least 3 holes to W: USGS, Coral Gold, Barrick Gold
Not shown is: Barrick DH w/ 1 oz/t Au intercept in upper plate near contact w/ lower plate, exact location unknown
Geology
EL soil geochemistry shows elevated Au and pathfinders along projection of Cortez fault and haloing NE gravity dome
Geochemistry and Gravity
EL soil REE ratio shows strong truncation along projection of Cortez fault
Halo around NE gravity dome, suggesting buried intrusion? Or carbonate bank?
Geochemistry and Gravity
EL soil Carlin-suite Z-scores highlight projection of Cortez fault
Geochemistry and Gravity
Deep - High quality classical Carlin-type target in Cortez Trend (50M+ oz Au)
Along projection of Cortez Hills Fault
Adjacent to Robertson deposit(2M oz Au)
High grade Au drilled immediately west of property
Lower plate target is similar depth as Goldrush deposit
ECRU
Gold Acres
Cortez
Goldrush
Buckhorn
Cortez Hills
Pipeline
Robertson
Intercepts up to 1 oz/t Au
Summary