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White Rock Minerals announces red mountain exploration in Alaska

Mining News - Published on Wed, 08 Aug 2018

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White Rock Minerals Ltd announced an update on exploration activities currently underway at its 100% owned high-grade zinc VMS project at Red Mountain in Alaska.

- Initial drilling at the Hunter prospect intersects zinc-rich massive sulphide mineralisation in the first two drill holes.
- Drill hole HR18-01 intersected 1.4m of massive sulphide from 48.25m down hole.
- Drill hole HR18-02 intersected 1.8m of massive sulphide from 60.84m down hole.
- The Hunter mineralisation remains open at depth and is yet to be drill tested along strike to either the east or west.
- Both drill hole massive sulphide intersections contain abundant visual zinc (sphalerite) with minor chalcopyrite (copper) mineralisation (see Figure 2 in link below), similar to the discovery outcrop.
- Rock chip assay results from the Hunter discovery outcrop confirm high grade zinc in the massive sulphide horizon with up to 18.6% Zn, 5.4% Pb, 2.3% Cu, 147g/t Ag & 0.7g/t Au.

Drill testing of the massive sulphide horizon discovered by recent ground reconnaissance at the Hunter prospect (refer ASX Release on 1 August 2018 "White Rock - Red Mountain - New Massive Sulphide Discovered") has confirmed the discovery with massive sulphide intersected in the first two drill holes completed. Holes HR18-01 & HR18-02 tested the massive sulphide 50m down dip from the discovery outcrop on the surface and then a second follow-up hole another 30m down dip from that hole and on the same cross section. The drill rig has now moved to test another new target at the Redback prospect, 1km east of the Hunter prospect.

MD & CEO Matt Gill said "We are excited with the success of the first two drill holes at the newly discovered Hunter prospect. These high-grade zinc results from the discovery outcrop are extremely encouraging. Grades in excess of 20% combined zinc + lead with significant silver grades as well as copper credits greater than 2% mark the potential for a significant deposit to emerge at Hunter. While Hunter is an exciting new discovery, drilling will also continue to test the other new targets identified from the ongoing reconnaissance mapping and geochemical sampling. What is exciting is that our on-ground recon crew has to date covered just 20% of our strategic tenement package of 143 square kilometres and already identified some seven areas of interest. That leaves a lot of upside for further discoveries. Further, such high-grade mineralisation at the three main prospects defined to date bodes well for future high-grade discoveries, with the Red Mountain project shaping up to be a high-grade zinc VMS camp of the future."

Hunter Prospect
The Hunter prospect was recently discovered through geological reconnaissance, where a 60cm wide massive sulphide outcrop rich in sphalerite (zinc) and galena (lead) was found. Subsequent prospecting mapped massive sulphide over 500m of strike within a carbonaceous phyllite that can be traced over 1km of strike. The zone of mineralisation is defined by anomalous soil geochemistry. Portable XRF analysis of soil samples returned up to 24.3% Zn, 2.4% Pb, 1.5% Cu & 249 ppm Ag (refer ASX Announcement 1st August 2018). Rock chip sampling of the massive sulphide from the discovery outcrop, as well as trenching along strike to define the position of the massive sulphide mineralisation, returned assay results up to 18.6% Zn, 5.4% Pb, 2.3% Cu, 147g/t Ag & 0.7g/t Au.

The massive sulphide horizon occurs along a steep south facing slope with abundant talus, strikes east-west and dips at approximately 45deg towards the north (see Figure 3 in link below). The massive sulphide horizon is hosted towards the base of a sequence of carbonaceous phyllites at the contact with underlying maroon-green phyllites. The horizon is locally associated with the development of chert beds within the sequence. A number of faults are interpreted to offset the horizon locally.

The first drill hole (HR18-01) was located above the massive sulphide horizon up slope to the north and drilled vertically so as to intersect the massive sulphide at a shallow position and confirm the dip of the VMS horizon. The second drill hole (HR18-02) targeted the massive sulphide horizon down-dip to the north from the same location. Both drill hole massive sulphide intersections contain abundant visual zinc (sphalerite) with minor chalcopyrite (copper) mineralisation (see Figure 2 in link below), similar to the discovery outcrop.

About Red Mountain (as more fully set out in the ASX Announcement dated 15 February 2016)
- The Red Mountain Project is located in central Alaska, 100km south of Fairbanks, in the Bonnifield Mining District. The tenement package comprises 230 mining claims over a total area of 143km2.
- The Red Mountain Project contains polymetallic VMS mineralisation rich in zinc, silver and lead, with potential for significant gold and copper.
- Mineralisation occurs from surface and is open along strike and down-dip.
- White Rock used historical drilling to determine a maiden JORC 2012 Mineral Resource estimate for the Dry Creek and West Tundra Flats deposit (ASX Announcement 26th April 2017). The Inferred Mineral Resource contains an impressive base metal and precious metal content with 678,000t zinc, 286,000t lead, 53.5 million ounces silver and 352,000 ounces gold.
- Good preliminary metallurgical recoveries of >90% zinc, >75% lead, >80% gold, >70% silver and >70% copper.

- Previous drilling highlights (ASX Announcement 15th February 2016) include:
Dry Creek
4.6m @ 23.5% Zn, 531g/t Ag, 8.5% Pb, 1.5g/t Au & 1.0% Cu from 6.1m
5.5m @ 25.9% Zn, 346g/t Ag, 11.7% Pb, 2.5g/t Au & 0.9% Cu from 69.5m
7.1m @ 15.1% Zn, 334g/t Ag, 6.8% Pb, 0.9g/t Au & 0.3% Cu from 39.1m

West Tundra Flats
1.3m @ 21.0% Zn, 796g/t Ag,9.2% Pb, 10.2g/t Au & 0.6% Cu from 58.6m
3.0m @ 7.3% Zn, 796g/t Ag, 4.3% Pb, 1.1g/t Au & 0.2% Cu from 160.9m
1.7m @ 11.4% Zn, 372g/t Ag, 6.0% Pb, 1.7g/t Au & 0.2% Cu from 104.3m

- VMS deposits typically occur in clusters ("VMS camps"). Deposit sizes within camps typically follow a log normal distribution, and deposits within camps typically occur at regular spacing. The known deposits at Dry Creek and West Tundra Flats provide valuable information with which to vector and target additional new deposits within the Red Mountain camp.
- Interpretation of the geologic setting indicates conditions that enhance the prospectivity for gold-rich mineralisation within the VMS system at Red Mountain. Gold mineralisation is usually found at the top of VMS base metal deposits or adjacent in the overlying sediments. Gold bearing host rocks are commonly not enriched in base metals and consequently often missed during early exploration sampling. This provides an exciting opportunity for potential further discoveries at Red Mountain.
- White Rock sees significant discovery potential, given the lack of modern day exploration at Red Mountain. This is further enhanced by the very nature of VMS clustering in camps, and the potentially large areas over which these can occur.

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Posted By : Rabi Wangkhem on Wed, 08 Aug 2018
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