Golden Brew, Nevada, U.S.A

Overview

The Golden Brew claims (“Golden Brew”) comprises 153 claims prospective for Carlin-style gold mineralization which has only been superficially explored by previous owners, including eight shallow drill holes totaling 2,885 feet completed in 1989. To date, gold mineralization at Golden Brew consists of a zone of gold bearing jasperoid, measuring 2,500 feet long and up to 200 feet wide, hosted in thin bedded platy Cambrian-aged carbonates. Wherever sampled, the jasperoid is anomalous in all Carlin-type gold deposit pathfinder elements, with gold grades ranging from anomalous to 4 grams/tonne. The zone is exposed on the western slope of the Toiyabe Mountain Range and is truncated on the west by a north-south trending range front fault.

Location

The Golden Brew project is situated along the western front of the Toiyabe Range, 20 miles south-southwest of Austin, near the southern boundary of Lander County, Nevada. The project area lies between 7,000 and 8,500 feet above sea level. Access from Austin is west along I-50 to old I-50 (Route 2). Eight miles south from Austin, turn left and proceed 11 miles southward (to the Reese River) along Route 21, an improved gravel road (see figure 1). Unimproved dirt roads traverse the remaining 7 miles eastward to the property. There is little in the way of local resources; but food and lodging can be obtained at Austin, a small town approximately 10 miles (16 km) northward or at Tonopah, approximately 80 miles (130 km) to the south. Major supplies and services would have to come from Reno approximately 150 miles distant to the west or Elko, about 100 miles to the north.

Regional Nevada Location Map

Regional Nevada Location Map

Golden Brew Location Map

Golden Brew Location Map

Geology & Mineralization

Regional Geology

The geology of the Golden Brew/Porter Canyon properties is similar to many of the sediment-hosted gold deposits in Nevada. Soon after deposition of the Paleozoic sediments, western, (Upper Plate) siliceous sediments were thrust-faulted and forced eastward over eastern, (Lower Plate) carbonate sediments along the Roberts Mountains thrust fault during the Antler orogeny. Other thrust faults of lesser extent developed in both the upper and lower plates.

The Antler orogeny was followed by the Sonoma (Permian-Triassic), Sevier (early Cretaceous), and Laramide (late Cretaceous) orogenies, all of which affected the area. Northwest-trending folds and faults apparently formed during or slightly before the Sonoma orogeny. Broad north-northeast directed folding and intrusion of the Birch Creek and Austin plutons occurred during the Sevier and Laramide orogenies. Erosion accompanied all three periods of compressional orogeny and during the Sevier orogeny, lower plate rocks started to be exposed, initiating the development of the erosional windows in which the mineral deposits are generally found.

High-angle north- to northeast-trending normal faults, resulting from the onset of Basin and Range extension in early Tertiary time, appear to have channeled later gold bearing solutions, leading to the formation of the various gold and base-metal deposits Sediments underlying the property range from Cambrian to Devonian in age. Quaternary alluvium is also present in many drainages and is deeper in the pediment areas. Because of the complex folding and faulting of the Antler orogeny, only the Cambrian units remain essentially intact.

Local Geology

The Golden Brew Project area as described by Kirwin (1989) is dominantly underlain by thin bedded limestones which belong to the Cambrian Crane Canyon Sequence (Stewart, McKee and Stager, 1977). The Crane Canyon Sequence in the Project area is thought to lie below the Roberts Mountains Thrust and above the Eastside Thrust.

Stratigraphy

The Crane Canyon Sequence describes a package of limestone and shale which must be several thousand feet thick, and occurs in the central Toiyabe Range. Regionally, the unit consists of laminated to very thin-bedded, grey, platy-limestones and subordinate shale or slate. Locally, the sequence contains laminated and silty limestone, calcareous or siliceous shale and siltstone, and rarely contains chert (Stewart, McKee and Stager, 1977).

In the Golden Brew Project area, the Crane Canyon Sequence consists mainly of thin bedded, finely crystallized, medium grey limestones which are thinly interbedded with very thin shale beds (the “Shaly limestone” member). Very few small, black chert lenses have been noted in the shaly limestones. The subordinate “Laminated limestone” member contains thin bedded, laminated, silty, medium to dark grey limestones. Calcareous shales (the “Limey shale”¬Ě member) have been mapped over small areas.

In the northern portion of the (1988) Golden Brew claim block, at least 1,000 stratigraphic feet of dark grey, platy, strongly foliated, locally pyritic slate, phyllite, and lesser shale is exposed. Some phyllite appears to have undergone greenschist facies metamorphism, possibly genetically related to the large felsic intrusive body situated immediately north of the claim block. The low-grade metamorphic rocks are anomalous within the Crane Canyon Sequence, and more closely resemble regional descriptions of the Cambro-Ordovician Broad Canyon Sequence (Stewart, McKee and Stager, 1977).

Intrusions

A small portion of a Tertiary-aged stock is exposed in the northern part of the Golden Brew claim block. Where exposed on the claim block, the intrusive unit is porphyritic, and granitic to granodioritic in composition. The intrusive, which weathers red, appears to contain smaller stocks and dikes of intermediate to felsic composition.

Structure

Sedimentary bedding attitudes which are exposed on the Golden Brew claim block indicate a large antiform underlying most of the area. North of the Foster fault, only the eastern half of the antiform is exposed. South of the “Foster” fault, both limbs are indicated. The cross sections reflect the hypothesis that the antiform has been modified by steeply dipping faults, which may be partially or wholly responsible for the antiform.

In the central Toiyabe Range, the Cambrian Crane Canyon Sequence lies above the Eastside Thrust and below the Roberts Mountains Thrust. Northeast of the Golden Brew claim block, the Crane Canyon Sequence is thrust over the Cambro-Ordovician Broad Canyon Sequence along the Eastside Thrust. In the northeast corner of the Golden Brew claim block, the contact between the Broad Canyon Sequence and the Crane Canyon Sequence is obscured. The obscured contact may be stratigraphic, or may be the Eastside Thrust, which is an important· ore controlling structure in the Kingston district. If the contact were the Eastside Thrust, then the exposed block of Broad Canyon Sequence would be up-thrown relative to the Crane Canyon limestones. However, the steeply dipping faults more likely have downthrown the Broad Canyon Sequence, and this suggests a stratigraphic contact between the formations. Regardless, the Eastside Thrust probably underlies the Crane Canyon Sequence on the Golden Brew claim block, and is an exploration target.

Numerous structures identified in the range.

Alteration

Due to the limited outcrop on the Golden Brew and Porter Canyon claim blocks, the following discussion by Kirwin (1989) of alteration is based on limited jasperoid outcrops and on trench exposures. The most prominent alteration type on the Golden Brew Claim block is intense silicification. Jasperoids are present in both the Bud Zone and the Guinness Zone. Outcrop exposures of jasperoid are dominantly weakly to strongly oxidized, containing disseminated and fracture-lining orange and red limonite. Where unoxidized, the jasperoids are very dark grey to black, and locally contain very finely disseminated pyrite.

The jasperoids are cryptocrystalline to finely saccharoidal in textures, and commonly contain (<1″) white quartz veins. The greatest concentrations of gold occur within strongly oxidized jasperoids which are crosscut by white quartz veins containing brecciated jasperoid fragments and some small vugs. In trench exposures, the contacts between the jasperoids and the surrounding rocks are structural. The jasperoid bounding faults generally strike N60W to N70W, and dip moderately-steeply to the southwest. Slickensides with similar orientations are common in the Bud and Guinness Zones, indicating reactivation of the fluid-controlling fault. Locally, jasperoid exposures in the trenches are intensely gouged and oxidized, indicating crosscutting fault motion following silicification. The silica-rich fluids appear to have followed restricted N60W to N70W structural conduits through relatively non-permeable host rocks. Haloes of weak silicification surrounding intensely silicified zones are uncommon. The jasperoid bodies are spatially associated with narrow zones of lower-grade alteration. The less altered zones are characterized by weak to strong decalcification, weak and rarely strong argillization, bleaching, and gouging. Some of the less altered zones contain significant gold mineralization.

Mineralization

The Golden Brew soil grid covers an area which contains only approximately 2% outcrop. Significant gold mineralization has been found only in jasperoid bodies and quartz veins, and the jasperoids generally are anomalous in gold. Two mineralized zones (the Bud Zone and the Guinness Zone) were identified by Meridian in 1988. The mineralized zones which lie on ridges and gullies between Porter Canyon and Brewer Canyon are enriched in gold, silver, and arsenic, and are characterized by strong silicification along faults, large calcite veins, and quartz veins. The Guinness Zone is larger than the Bud Zone, and has not yet been drill tested. As much as 2.2 ppm gold has been reported from samples collected from Bud Zone jasperoids, and as much as 1.7 ppm gold has been reported from the Guinness Zone.

The Bud Zone lies topographically below the Guinness Zone (see figure X). The poorly exposed Bud Lite Zone has been shown to be an extension of the Bud Zone. The Bud Zone, which is 400 feet long and 100 feet wide, is characterized by jasperoids and quartz veins, and trends roughly N80W. Extending the Bud Zone to the Bud Lite Zone lengthens the zone to 600 feet long.

The Guinness Zone, which is 800 feet long and 150 feet wide, is characterized by large (+20 feet wide) calcite veins, with large (up to 8 feet wide) quartz veins and subordinate jasperoid outcrops. The gold mineralization is closely associated with the jasperoid bodies, although some gold is associated with the quartz veins. Small amounts of gold have been detected distal to the jasperoids in limestone outcrop rock chip samples. The overall trend of the Guinness Zone is approximately East-West.

The focus of the current exploration is for targets localized along some of these mineralized structures, but where they extend under the cover gravels to the west.

Exploration History

1998-1999: During the latter half of 1988 and January of 1989, a program of surface exploration, evaluation and limited drilling was conducted on the Golden Brew claim block by Meridian Gold Company. The exploration program consisted of the following work:

  • 1″=500′ scale mapping of the claim block
  • 1″=100′ scale ‘mapping of the soil grid area.
  • 338 soil samples were collected on 100-foot centers, and were analyzed for gold, silver and arsenic.
  • 56 rock chip samples were collected, and were analyzed for gold and silver.
  • Three trenches were cut across the Bud Zone jasperoid, exposing rock along most of their lengths. A total of 850 feet of trench was constructed.
  • The trenches were mapped in detail, and were channel sampled. A total of 59 continuous channel samples were collected and analyzed for gold, silver, and arsenic.
  • 3,400 feet of drill roads were constructed in the Bud Zone and the Bud ‘Lite Zone.
  • Eight drill holes were drilled in the Bud Zone, for a total footage of 2,885 feet.

2010-2011: Highway 50 Gold (formerly Tatmar Ventures Inc.) conducted extensive gravity and CSMAT geophysical surveys across the Golden Brew property, west of the range-front fault in an area of gravel cover. These surveys were designed to locate gold bearing structures within the favourable host rocks at reasonable exploration depths beneath the gravel cover. The geophysical program was successful in locating an uplifted horst block with potential gold bearing structures extending through it. In 2011, four RC-holes totalling 8,800 feet were drilled to test these targets.

2014: Regulus Resources Inc. options the Golden Brew project from Highway 50 Gold with a firm work commitment of $US 500,000 in the first year. Regulus concentrates on permitting the project for drilling.

Drilling

In 1988, Meridian drilled eight percussion drill holes into the Bud Zone, which is located within the exposed range to the east of the current Golden Brew claims. The following drill results were obtained by Meridian in 1988: samples were sampled every five feet, and the cuttings were analyzed for gold, silver, and arsenic. The gold geochemical data are presented in Table 1.

Table 1: Meridian Drill Results 1988

Drilling Results at Golden Brew 1988
Drill Hole From (ft) To (ft) Width (ft) Gold (opt) Width (m) Gold (g/t)
GB-1 65 125 60 0.007 18.3 0.240
incl. 75 110 35 0.01 10.7 0.343
GB-2 215 235 20 0.01 6.1 0.343
GB-3 0 60 60 0.016 18.3 0.549
incl. 25 55 30 0.021 9.1 0.720
incl. 40 55 15 0.025 4.6 0.857
GB-4 discouraging geochemical data
GB-5 140 150 10 0.005 3.0 0.171
GB-6 0 30 30 0.006 9.1 0.206
GB-7 Did not intercept target
GB-8 discouraging geochemical data
From Meridian Report

Highway 50 Gold completed four holes of its initial eight hole, +10,000 foot reverse circulation drill campaign at Golden Brew. A total of approximately 8,800 feet of drilling was performed. The geophysically-interpreted uplifted carbonate horst block was encountered in three of the first four holes with thick intersections of favourable carbonate host rock stratigraphy. Geophysical modeling has been completed and will be used to target drill holes for the upcoming drill program. Assay results show a 150 foot interval of anomalous arsenic (to 290 ppm) and antimony (to 24 ppm) in drill hole GB-3 (Table 2). These levels are higher than the anomalous soils peripheral to the auriferous jasperoid at the range front 7500 feet to the east.

Table 2: Highway 50 Drill Results 2011

Drill Hole # Location Interval Length Description
GB-1 0 to 2,145 ft.
2,145 to 2,200 ft.
2, 145 ft.
55 ft.
Alluvium Volcanic tuffs
GB-2 6,000′ south of GB-1 0 to 2,060 ft.
2,060 to 2,160 ft.
2,160 to 2,180 ft.
2,060 ft.
100 ft.
20 ft.
Alluvium Volcanic tuffs Thin-bedded limey siltstones
GB-3 4,000′ south of GB-2 and 7,000′ WNW of the large auriferous jasperoid at Golden Brew 0 to 1,380 ft.
1,380 to 2,100 ft.
2,100 to 2,200 ft.
1,380 ft.
720 ft.
100 ft.
Alluvium Thin-bedded limey siltstones Carbonaceous phyllites
GB-4 3,000′ south of GB-3 0 to 1,685 ft.
1,685 to 1,200 ft.
1,685 ft.
515 ft.
Alluvium Thin bedded limey siltstones