The JV has released the second set of results from recent reverse circulation (RC) drilling in the Main and Extended Pits at the historical Horseshoe South mine.
This drilling was fully funded by OM (Manganese) Limited, a subsidiary of OM Holdings Limited (ASX:OMH), under Bryah Basin JV Agreement, with Bryah managing the project.
BYH managing director Neil Marston said: “The latest drilling at the historic Horseshoe South Mine has yielded some significant manganese results within the Main and Extended Pit areas.”
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At the Main Pit, 60 drill holes for 454 metres were drilled with results from the first 19 holes recording shallow high-grade manganese.
Best results are:
- 4 metres at 40.9% manganese, including 2 metres at 46% from 10 metres (Hole HSRC038);
- 3 metres at 30.9%, including 1-metre at 42.9% from 6 metres (Hole HSRC035); and
- 3 metres at 28.4%, including 1-metre at 35% from 9 metres, (Hole HSRC026).
The company believes the high-grade manganese channel beneath the open pit floor intersected by hole HSRC038 confirms the potential for shallow high-grade manganese to exist within the mining lease, and more broadly within the project area.
Marston said: “At the Main Pit, drilling was targeted at locating buried channels and layers of manganese missed by earlier operators.
“These results demonstrate the existence of very high-grade manganese at shallow depths beneath the existing pit, so additional drilling is warranted in future programs.”
Further assay results are expected in the next two weeks.
Horseshoe South Main Pit - drill hole location plan
At the Extended Pit area, 17 drill holes for 598 metres were drilled to test for extensions of the manganese mineralisation intersected in 2019 and by previous exploration.
Best results are:
- 19 metres at 24.6% manganese, including 3 metres at 37.1% from 26 metres (Hole HERC044);
- 14 metres at 22.5% and 7 metres at 22.5% from 18 metres (Hole HERC056);
- 5 metres at 23.2 % and 11 metres at 24.8% from 9 metres (Hole HERC049),
- 17 metres at 21.5% manganese from 4 metres(Hole HERC047); and
- 14 metres at 23.7% manganese from 7 metres(Hole HERC048).
Marston said: “The grades and thickness of mineralisation at the Extended Pit confirm our view that the site has potential for economic tonnes and grades of manganese.
“We have commenced a program of beneficiation test-work on bulk samples recently collected to see how this mineralisation can be upgraded through simple processing.”
Drill holes HERC047–HERC049 recorded wide zones of manganese beneath the historical drilling, confirming the potential for additional mineralisation to exist below the current pit floor.
Further drilling within the open pit to extend these mineralised zones will be undertaken in upcoming programs.
Tenements and geology map
Mining lease boundary
Drill holes at the Extended Pit are close to the southern boundary of M52/806, which adjoins M52/1048 to the south.
A mineral resource up to the northern boundary of M52/1048 has been publicly reported.
Marston said: “These pits lie on a granted mining lease which can be quickly re-permitted for manganese mining operations.
“The company has also engaged with the adjoining leaseholder about a potential collaboration across the common lease boundary in the Extended Pit area so that these significant manganese zones near our southern boundary can be effectively developed.”
Mount Labouchere and Windalah
A first pass drilling program was also undertaken at the Mount Labouchere prospect to test around an area of outcropping manganese.
The program consisted of 16 drill holes for 256 metres and demonstrated that there are no significant extensions of manganese beyond the outcropping area, however, the samples assayed did show anomalism in copper and cobalt.
Bryah intends to collect the remaining 1-metre samples which have not been submitted for analysis and have these analysed for a broader suite of minerals to determine the significance of this copper and cobalt anomalism.
There were also three RC holes completed at Bryah's Windalah gold prospect, with results expected next week.
Planning for the next manganese drilling program in the Bryah Basin is underway and this is expected to include a round of diamond drilling to collect samples for further metallurgical test-work.