The 7279 ha Bronco Property, located in the Mackenzie Mountains, straddles the border of the Yukon and NWT 230 km SW of Norman Wells, NWT. Access is by helicopter from the Willowhandle exploration camp, 35 km to the NE. The camp is supplied by twin engine float plane from Norman Wells.
In 2006, Eagle Plains obtained the Rio Tinto pulp samples collected during their extensive 1970’s regional silt geochemical survey in the Mackenzie Mountains (5700 samples over 19,000 sq/km). Modern geochemical reanalysis led field crews to anomalous areas and the Bronco, Mustang and Golfball Zn-Pb-Ag showings were discovered. The project overlies stratigraphy prospective for sedimentary exhalative (“SEDEX”) mineralization.
The Bronco claims are owned 100% by Eagle Plains with no underlying royalties or other encumbrances.
- Multiple high-grade mineral occurrences property-wide
- Favourable geology for hosting both replacement and SEDEX style deposits
- Encouraging exploration to date with comprehensive database
- Untested high-priority geochemical targets associated with favourable geology
- New early-stage discovery warranting further exploration
The property is underlain by Proterozoic to Mesozoic rocks which host significant mineral deposits in the region. Black shales of the Misty Creek Embayment, a major feature of the property, are flanked by Proterozoic to Paleozoic carbonate rocks. All these rock types are well exposed on the property.
The 7+ km Bronco-Golf Ball corridor of mineralization is a trend of promising new carbonate-hosted Zn-Pb showings in close association with structure and dissolution textures suggesting a substantial fluid event followed these deep rooted structures. The impermeable shales created a barrier resulting in base-metal precipitation near the crest of a large anticlinal fold favourable for generating a large, high-grade, Zn-Pb deposit within the limestones. Considerable SEDEX-style Zn-Pb-Ag potential also exists within unexplored horizons contained in black shale basins overlying carbonate units on much of the project. Numerous untested silt and soil geochemical anomalies and new showings remain to be followed up.
1966 - The GSC examines part of the area during Operation Selwyn
1972 - Arrow InterAmerica begins exploring Pb-Zn occurrences of the Godlin Lakes area
1973 - Welcome North options the Godlin Lake Properties and other companies begin exploring the region
1974 - 1977 Welcome North organizes the Arctic Red Joint Venture regional exploration program
1974 - 1977 Rio Tinto discovers significant Zn-Pb mineralization at the Gayna River Property
1976 - Welcome North discovers Zn-Pb mineralization at the AB showing.
1978 - Welcome North options Bear Twit Zn-Pb claims to Bethlehem copper.
1980 - 1983 Inco conducts regional exploration in headwaters of Mackenzie Mountains.
1993 - Archer Cathro conducts regional exploration program for diamonds
The Bronco Zn-Pb-Cu-Ag Showing is exposed on the side of a steep bluff above tree line where sphalerite, galena, tetrahedrite and secondary azurite plus malachite occur in altered limestone. The showing and altered area is 7 m wide and 16 m long.
The Pb-Zn Mustang Showing lies 250 m east of the Bronco and is exposed on the side of a steep bluff. It forms an altered area 20 m by 30 m within a carbonate host.
The Golf Ball Zn-Pb showing is exposed in limestone immediately underlying shales. Mineralization is hosted in structures within the limestone as the impermeable overlying shales caused traps for mineralizing fluids.
A number of Zn-Pb showings occur throughout the Bronco Property area. Mapping and prospecting traverses completed in 2007 discovered several new occurrences; all are hosted in limestones and mineralization consists of mainly sphalerite and galena.
Eagle Plains Exploration
2005 – EPL acquires 8 prospecting permits in the district, field verification is conducted.
2006 – EPL acquires 6 more prospecting permits and obtains 5700 Rio Tinto RGS samples over the area for reanalysis. During field reconnaissance the Bronco, Mustang and Golfball Zn-Pb-Ag showings are discovered. Some Highlights include:
||Description of Zone and Sampling
||420 g/t Ag, 0.9% Cu and 2.8% Pb over 13m
including 1313 g/t Ag, 2.7% Cu, 10.2% Pb, and 1.1% Zn over 3m
||14.4%, 12.7% and 24.4% Zn
||Float occurrence 2km from Bronco Showing
||17.5%, 19.8%, 12.7%, 25.4%, 21.3%, 18.5% Zn
||7 km along strike of the Bronco Showing
Eagle Plains 2007 Exploration Program
This program focused on the mineralized corridor host to a number of new Zn-Pb-Ag showings including the Bronco, Mustang, and Golf Ball. These belong to a 7 km long zone of numerous occurrences deposited during a large-scale fluid event plumbed by regional structures and hosted in Sekwi limestone. Highlights of 888m of diamond-drilling over 5 holes at the Bronco and Mustang showings include:
||Description of Zone and Sapling
||0.2% Pb, 0.1% Zn and 19.7 g/t Ag over 13m
Including 0.2% Pb, 0.1% Zn and 42.4 g/t Ag over 4m
||0.1% Pb, 0.1% Zn and 13.3 g/t Ag over 9m
Detailed mapping and prospecting of the mineralized trend between Bronco and Golf Ball showings was conducted. The anomalous Zn values in numerous locations near these showings correlate with outcrop and float occurrences of sphalerite and galena showings within the Sekwi Formation limestone in most instances.
A geophysical survey program was carried out over the Bronco, Mustang and Golf Ball mineralized areas and along the mineralized trend.
Considerable Zn-Pb-Ag potential remains in the explored areas along with promising unexplored horizons.
Specific recommendations for future work are:
- Prospecting and mapping of the mineralized corridor, in particular the core of the anticline and the western limb of the Border Anticline
- Petrographic analysis of the Bronco and Mustang core to clearly determine a paragenesis and gain knowledge about the mineralizing fluid event
- Prospecting and sampling the new showings in the eastern limb of the anticline and investigating the western limb
- Investigate the source of a number of significant Zn-Pb-Ag geochemical anomaly clusters in the Bronco area
- Evaluation of the mineralizing system at the Golf Ball through drilling or trench sampling
- A large portion of the Bronco Permit Group is underlain by the Earn Group and should be explored for Sedex mineralization.
Eagle Plains - A Project Generator
Eagle Plains Resources is a project generator with mineral exploration properties of merit that meet qualifying transaction requirements. The Bronco Property is available for option to joint-venture partners. We facilitate the listing process for capital pool companies and initial public offerings while providing technical expertise for exploration programs. Companies interested in co-operatively exploring any of these projects please contact: Tim Termuende at email@example.com or Mike Labach at firstname.lastname@example.org or call 1 866 Hunt Ore (486 8673).
Updated June 3, 2016