Occurrence Details


Occurrence Number:
116B 197
Occurrence Name:
Kokanee Deposit
Occurrence Type:
Hard-rock
Status:
Past Producer
Date printed:
12/9/2022 3:27:32 PM

Print Options


General Information
Capsule
Work History
References

General Information

Primary Commodities: gold
Aliases: Brewery Creek
Deposit Type(s): Epithermal Au-Ag: Low Sulphidation, Porphyry-related Au
Location(s): N - W
NTS Mapsheet(s): 116B01
Location Comments: Location from satellite imagery and company location map
Hand Samples Available: No
Last Reviewed:

Capsule

Cretaceous (91 Ma) Tombstone Suite monzonite and quartz monzonite intrudes Paleozoic Earn and Road River Groups lithologies as a series of semi-conformable sills along a 15km strike length defining the Brewery Creek Reserve Trend.  Younger, Tombstone Suite syenite and biotite monzonite occur locally in the south-central portion of the property.  All compositional phases of the Tombstone Suite intrusives are known to host gold mineralization.

Sill emplacement is primarily controlled by a tectonized, graphitic argillite at the contact between the Earn and Road River Groups.  This contact is also the locus of NNE-directed thrust faulting that has placed thin (<150 m thick) sequences of Silurian siltstone against Devonian siliciclastic rocks.  The age of faulting is probably related to earlier Mesozoic compression along the Dawson, Tombstone and Robert Service Thrust Faults and the closing of the Selwyn Basin.

Brewery Creek deposits exhibit characteristics of both epithermal type and intrusive-related gold systems. It is generally considered to be an alkalic intrusion-associated gold deposit, as most of the mineralization is concentrated within or proximal to the monzonites of the Cretaceous Tombstone Suite.  Gold mineralization occurs in fracture-controlled quartz stockwork in both siliciclastic and intrusive rocks along an east-northeast striking, moderately south dipping structural trend known as the Brewery Creek Reserve Trend. 

Altered intrusive rocks are typically the preferred host for gold mineralization, however gold mineralization at the Pacific deposit exhibits a strong preference for a siltstone host, and in other deposits into adjacent intrusive rocks.  Major ore-controlling structures in intrusive rocks are related to a post Tombstone age, NNW compressional event that produced ESE and NE striking conjugate shears and ENE listric normal faulting localized along graphitic argillite/intrusive sill contacts. Approximately 85% of the mined ore was hosted by the various Cretaceous-aged quartz monzonite sills with the balance contained in silicified and brecciated Earn Group sediments.

The Kokanee deposit was mined by Viceroy from four pits, which have all been partially backfilled.  The southern two pits remain mostly open while the northern two are almost entirely backfilled and reclaimed.  The deposit is centrally located along the Brewery Creek Reserve Trend and formed in the thickest and most extensive part of the Cretaceous quartz monzonite sill complex.  The current remaining resource is defined by 31 core holes and 506 RC holes, totaling 29,654 m. The zone is approximately 1100 m in length, 40 m wide, and 190 m down dip.

Mineralized material at Kokanee occurs primarily in the quartz monzonite sill complex and subordinately in siltstone and argillite.  Observations of mineralized material exposed in pit walls shows millimeter-scale veinlets with iron-oxide ± quartz fillings.  The mineralized quartz monzonite typically contains several percent of evenly disseminated oxidized pyrite.

Work History

Date Work Type Comment
6/1/2018 Drilling
6/1/2018 Lab Work/Physical Studies
6/1/1998 Geochemistry
6/1/1998 Lab Work/Physical Studies
6/1/1998 Drilling
6/1/1998 Trenching
6/1/1997 Geochemistry
6/1/1997 Geology
6/1/1997 Geochemistry
6/1/1997 Drilling
6/1/1997 Trenching
6/1/1997 Geochemistry
6/1/1996 Geochemistry
6/1/1996 Drilling
6/1/1996 Other
6/1/1996 Geochemistry
6/1/1996 Drilling
6/1/1996 Trenching
6/1/1996 Geochemistry
6/1/1996 Geochemistry
6/1/1996 Development, Surface
6/1/1994 Lab Work/Physical Studies
6/1/1994 Geochemistry
6/1/1994 Lab Work/Physical Studies
6/1/1994 Geochemistry
6/1/1994 Drilling
6/1/1994 Drilling
6/1/1994 Trenching
6/1/1994 Geochemistry
6/1/1994 Geology
6/1/1993 Lab Work/Physical Studies
6/1/1993 Airphotography
6/1/1993 Studies
6/1/1993 Lab Work/Physical Studies
6/1/1993 Development, Surface
6/1/1993 Geochemistry
6/1/1993 Drilling
6/1/1993 Studies
6/1/1993 Lab Work/Physical Studies
6/1/1993 Geochemistry
6/1/1992 Geochemistry
6/1/1992 Studies
6/1/1992 Other
6/1/1992 Geochemistry
6/1/1992 Drilling
6/1/1992 Ground Geophysics
6/1/1992 Studies
6/1/1992 Ground Geophysics
6/1/1992 Lab Work/Physical Studies
6/1/1992 Trenching
6/1/1992 Geochemistry
6/1/1991 Geochemistry
6/1/1991 Drilling
6/1/1991 Studies
6/1/1991 Other
6/1/1991 Lab Work/Physical Studies
6/1/1991 Drilling
6/1/1991 Ground Geophysics
6/1/1991 Trenching
6/1/1991 Geochemistry
6/1/1991 Geochemistry
6/1/1991 Geology
6/1/1991 Development, Surface
6/1/1990 Lab Work/Physical Studies
6/1/1990 Geochemistry
6/1/1990 Drilling
6/1/1990 Geochemistry
6/1/1990 Drilling
6/1/1990 Ground Geophysics
6/1/1990 Ground Geophysics
6/1/1990 Lab Work/Physical Studies
6/1/1990 Trenching
6/1/1990 Geochemistry
6/1/1990 Geochemistry
6/1/1990 Geology
6/1/1989 Geochemistry
6/1/1989 Drilling
6/1/1989 Geochemistry
6/1/1989 Drilling
6/1/1989 Ground Geophysics
6/1/1989 Ground Geophysics
6/1/1989 Pre-existing Data
6/1/1989 Trenching
6/1/1989 Geochemistry
6/1/1989 Geochemistry
6/1/1989 Geology
6/1/1988 Geochemistry
6/1/1988 Geology
6/1/1988 Geochemistry
6/1/1988 Geochemistry
6/1/1988 Other

Related References

Number Title Page(s) Reference Type Document Type
093601 Assessment Report on the BDM, EEL, ELE, FLEE, LEE Claims Yukon Government: Energy, Mines and Resources Assessment Report
097210 Work Done on the Brewery Creek Property in the year 2018 Yukon Government: Energy, Mines and Resources Assessment Report
093962 Brewery Creek Project 1998 Geological, Geochemical, Trenching and Drilling Report on the BDM, EEL, FLEE, ELE, and LEE Claims Yukon Government: Energy, Mines and Resources Assessment Report
093078 Geological, Geochemical and Geophysical Report on the EEL Claims Yukon Government: Energy, Mines and Resources Assessment Report
092928 Geological, Geochemical, Geophysical and Drilling Report on the LEE, EEL, ELE and FLEE Claims Yukon Government: Energy, Mines and Resources Assessment Report
093820 Brewery Creek Project 1997 Geological, Geochemical, Trenching and Drilling Report on the BDM, EEL, FLEE, ELE, and LEE Claims Yukon Government: Energy, Mines and Resources Assessment Report
093191 Drilling Report on the ELE, LEE, EEL, FLEE Claims Yukon Government: Energy, Mines and Resources Assessment Report
093309 Assessment Report on the ELE, LEE, EEL, FLEE Claims Yukon Government: Energy, Mines and Resources Assessment Report
093027 Geological, Geochemical, Geophysical and Drilling Report on the EEL, LEE, ELE, and FLEE Claims Yukon Government: Energy, Mines and Resources Assessment Report
092678 Geological and Geochemical Report on the Brewery Creek Project Yukon Government: Energy, Mines and Resources Assessment Report
092788 Geological, Geochemical, Geophysical and Drilling Report on the LEE 1-82, EEL 1-52, and ELE 1-16 Claims Yukon Government: Energy, Mines and Resources Assessment Report