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Occurrence Details

Occurrence Number
116B 205
Occurrence Name
Lone Star Zone
Occurrence Type

General Information

Primary Commodities: gold
Aliases: Brewery Creek
Deposit Type(s): Epithermal Au-Ag: Low Sulphidation, Porphyry-related Au
Location(s): 64.02 N, -138.1910 W
NTS Mapsheet(s): 116B01
Location Comments: Location from satellite imagery and company location map
Hand Samples Available at YGS: No


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 Lone Star mineralized area lies approximately 5 km south of the main Reserve Trend along the northeast side of the Classic Fault, southeast of and adjacent to the Classic zone.  Surface mineralization was first recognized by soil sampling in the 1990’s but the area remained untested until 2012.  In 2012, 17 diamond drill holes and 12 reverse circulation drill holes, totaling 6,147 m were completed. The zone is approximately 1100 m in length, 20 m wide, and 220 m down dip. 

Drilling by Golden Predator Corp. in 2012 intersected multiple mineralization types including disseminated gold and sheeted quartz/carbonate/pyrite+\-arsenopyrite veins in syenitic intrusive stocks and sills. The 2012 drill program also discovered gold bearing calc-silicate skarn mineralization in carbonate rocks on the periphery to the syenitic intrusive. Three styles of mineralization occur at Lone Star; elevated Au associated with skarns, disseminations in syenite, and auriferous sheeted quartz veins.  The geometry of the system is poorly understood; it remains open in both strike directions and at depth.

Location Map

Last Updated: Jun 28, 2021

Work History

Year Work Type Comment
2018 Drilling: Diamond 2 holes
2018 Geochemistry: Drill Core
2018 Lab Work/Physical Studies: Metallurgical Tests
2012 Drilling: Diamond 17 holes, 3,873.56 m
2012 Drilling: Reverse Circulation 12 holes, 2,282.9 m
2012 Geochemistry: Drill Core
2012 Geochemistry: Drill Cuttings
1997 Geochemistry: Soil
1997 Geology: Bedrock Mapping
1994 Geochemistry: Soil
1994 Geology: Bedrock Mapping
1993 Airphotography: Interpretation
1993 Geochemistry: Soil
1993 Geology: Bedrock Mapping
1993 Studies: Environmental Assessment/Impact
1992 Geochemistry: Soil
1992 Ground Geophysics: IP
1992 Ground Geophysics: Magnetics
1992 Other: Line Cutting
1991 Geology: Bedrock Mapping
1990 Geochemistry: Soil
1990 Geology: Bedrock Mapping

Regional Geology - Terrane


Regional Geology - Bedrock

Period Max:
Age Max: MA
Period Min:
Age Min: MA
Rock Major:
Rock Minor:
Geological Unit (1M):
Geological Unit (250K):

Related References

Number Title Page(s) Document Type
096389 2012 Assessment Report on the Brewery Creek Property Assessment Report
093309 Assessment Report on the ELE, LEE, EEL, FLEE Claims Assessment Report
093191 Drilling Report on the ELE, LEE, EEL, FLEE Claims Assessment Report
093820 Brewery Creek Project 1997 Geological, Geochemical, Trenching and Drilling Report on the BDM, EEL, FLEE, ELE, and LEE Claims Assessment Report
093962 Brewery Creek Project 1998 Geological, Geochemical, Trenching and Drilling Report on the BDM, EEL, FLEE, ELE, and LEE Claims Assessment Report
093078 Geological, Geochemical and Geophysical Report on the EEL Claims Assessment Report
092928 Geological, Geochemical, Geophysical and Drilling Report on the LEE, EEL, ELE and FLEE Claims Assessment Report
093027 Geological, Geochemical, Geophysical and Drilling Report on the EEL, LEE, ELE, and FLEE Claims Assessment Report
097210 Work Done on the Brewery Creek Property in the year 2018 Assessment Report

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