Rockfire Resources plc (LON: ROCK), the gold and base-metal explorer, is pleased to announce further assay results from drilling the new discovery zone (‘Central Breccia’) at the Company’s 100%-owned Plateau Gold Deposit in Queensland, Australia.
The Company believes this new mineralised zone forms part of the near-surface expression of a large gold system encountered in BPL025 (as announced on 26 November 2019).
· BPL015 intercepted another excellent interval of 7 m @ 2.3 g/t Au, within a broader interval of 12 m @ 1.3 g/t Au and a larger interval of 29 m @ 0.63 g/t Au (from surface);
· BPL016 has returned a similarly pleasing 5 m @ 1.3 g/t Au (from 14 m depth) within a broader zone of 18 m @ 0.7 g/t Au;
· These new results include an individual intercept of 1 m @ 7.8 g/t Au (BPL015);
· These holes now take the total confirmed mineralised length of the new discovery at the Central Breccia to +150 m;
· Gold mineralisation remains open at the Central Breccia in all directions;
· This additional mineralisation is not currently included in Rockfire’s Resource Estimate of 41,000 ounces of gold, estimated in July 2019;
· The Company is awaiting the results from a further nine shallow exploration/resource-infill/resource-extension drill holes from the October 2019 drill program. These results are expected to be received from the laboratory over the next two weeks, and further announcements will be made in due course.
Please refer to the following link to view the drill hole locations.
David Price, Chief Executive Officer of Rockfire, commented:
“It is extremely pleasing to have four holes drilled into a new target, with all four holes returning potentially economic gold grades and potentially mineable widths, so close to surface.”
“These results build on the recently discovered Central Breccia zone, which was identified by the Rockfire exploration team during mapping and sampling. The results from these holes demonstrate the strength of the near surface gold mineralisation, which is still open in all directions. The Central Breccia is a priority target for further exploration.”
“These holes are interpreted to represent the near-surface expression of what we believe to be a large gold system encountered at depth in hole BPL025. Importantly, the four exploration holes into the Central Breccia extends the mineralised target zone by another 150 m towards the east. The Central Breccia lies above a recently demonstrated geophysical resistivity and chargeable anomaly, providing Rockfire with a very large target for future gold exploration.”
“Results from 9 more drill holes are awaited from the laboratory. The awaited results are from resource infill/extension and exploration holes, with depths varying between 30 m and 90 m. The market will be kept informed of additional drilling results as they are received by the Company”.
Plateau October 2019 drilling collar file
Qualified Person Statement:
Information in this announcement that relates to exploration results is based on information compiled by Mr David Price, a Director of Rockfire Resources plc, who is a Fellow of the Australasian Institute of Mining and Metallurgy (FAusIMM). Mr Price has sufficient experience relevant to the style of mineralisation and type of deposit under consideration and to the activity which has been undertaken to qualify as a Competent Person as defined by the 2012 Edition of the Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves (the JORC Code) and under the AIM Rules – Note for Mining and Oil & Gas Companies. Mr Price consents to the inclusion in the announcement of the matters based on their information in the form and context in which it appears.
About the Plateau Gold Deposit
The Plateau Gold Deposit is located in Queensland Australia, approximately 50 km southeast from the gold mining centre of Charters Towers. Plateau lies 17 km east of the operating Pajingo Gold Mine (+ 3 M oz Au), and 47 km southwest of the +10 M oz Au Ravenswood gold mining operations, including Mt Wright. Plateau is a breccia-hosted gold system, comprising similar geology and mineralisation to that seen at the nearby gold mines, Mt Wright and Kidston. Rockfire is targeting another Mt Wright-style and size of deposit.
At surface, Plateau hosts gossanous and jasperlitic veins and gold-bearing breccia at the margin of a felsic (rhyolite) plug. The deposit is under-explored but historical drilling has returned intervals of high-grade gold from a distinct circular magnetic feature. This feature is partly demagnetised and truncated by a linear northeast fault with associated polymict breccia, gossan and chalcedonic and jasperoidal silica flooding.
Previous drilling campaigns have intersected encouraging drilling intersections including 89 m @ 1.57 g/t Au from 61 m (hole PL102), 11 m @ 2.0 g/t Au from 44 m (hole PLP127) and 22 m @ 1.9 g/t Au from 39 m (BPL002).
A single, deep diamond hole drilled by Newcrest Mining in 2007 intersected 300 m @ 2.2 g/t Ag (hole PLDD06001), which highlights the potential size of the mineralised system at depth. This hole provides clear evidence that a large mineralised gold +/-silver system exists deeper below current drilling levels.
Plateau Exploration History
In 1985, Esso Australia Ltd drilled 876 m of core drilling (in 3 holes), 350 m of percussion drilling (in 4 holes) and 126 m of pre-collar drilling for a total of 1,352 m. Impressive drilling results were encountered close to surface, including: 3 m @ 4.87 g/t Au, 3 m @ 3.38 g/t Au, 89 m @ 1.57 g/t Au, 5 m @ 2.77 g/t Au, and 40 m @ 1.37 g/t Au. A total of 1,260 m of trenching was undertaken during the 1985 field season with results including 40 m @ 1.37 g/t Au (Trench 3700 E). Esso also sampled the surface rocks at Plateau, which returned a 116 g/t Au assay.
In 1988, City Resources Ltd drilled 30 reverse circulation drill holes for 1,670 m at Plateau. Values up to 16 g/t Au were intersected in drilling which tested gold mineralisation down to 60 m vertical depth. Best results from this drilling include: 8 m @ 3.03 g/t Au, 10 m @ 5.01 g/t Au, 14 m @ 2.44 g/t Au, 6 m @ 3.20 g/t Au, and 4 m @ 4.79 g/t Au.
In 2007, Newcrest Mining Limited drilled a single 853.7 m deep diamond drill hole (PLDD06001). This hole was designed to test mineralization at depth beneath the shallow mineralisation at Plateau. PLDD06001 intersected 300 m @ 2.2 g/t Ag but only low-grade gold. The drill hole intersected breccia between 150 m and 520 m below surface, confirming that the breccia is much larger than the surface expression suggests. This hole is now thought to have intersected the very edge of the projected mineralised lode, but likely too far to the west to encounter significant gold. A second hole was planned by Newcrest further to the east but this hole was never drilled.
In late 2017, Rockfire Resources plc drilled 11 drill holes for 2,111 m of reverse circulation drilling. This drilling successfully encountered 10 m @ 1.9 g/t Au, 22 m @ 1.86 g/t Au and 10 m @ 1.37 g/t Au. Significant silver was also encountered including 43 m @ 4 g/t Ag.
About Rockfire Resources
Rockfire Resources is a mineral exploration company exploring for precious and base metals in Australia. Rockfire owns each of its exploration licences 100% and is an active and aggressive explorer.
The minerals targeted by Rockfire include gold, copper, silver and zinc, of which the company has multiple prospects and targets in Queensland, Australia. Rockfire has a portfolio of projects which are within trucking distance of operating gold mines, which may provide opportunity for toll treatment of any future resources identified.
The Company has adopted a strategy of growth based on advancing exploration on its existing portfolio of projects, as well as a continual assessment of quality opportunities to acquire outstanding mineral projects worldwide.
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