De Grey Mining Limited (ASX: DEG) has obtained excellent resource infill drilling results from the Brolga zone at the world-class Hemi gold discovery in Western Australia.
The drilling is being conducted as part of the Prefeasibility Study (PFS) of the Mallina Gold Project.
Brolga was identified, along with Diucon and Falcon, in a Scoping Study released in October 2021 as one of the early proposed production sources for the Project. Resource definition drilling allows more of the Brolga resource to be classified as JORC Indicated mineralisation. This increases the potential production target and Ore Reserve for the PFS and provides increased confidence in the Project’s projected cashflow from early production sources.
Resource definition drilling at Brolga has focussed on the proposed Stage 1 pit from the Scoping Study. The Hemi maiden Mineral Resource contained within the Brolga Stage 1 pit comprised 1.29Moz @ 1.3g/t Au.
The strip ratio of the Brolga Stage 1 pit was 2.1:1 including the pre-stripping of un-mineralised transported sediments.
Proposed production from Brolga is a key factor in the payback period of the Project of less than two years identified in the recently announced Scoping Study.
Drilling at Brolga will also be extended to the south and southwest and at depth of the Stage 1 pit with the aim of extending mineralisation and increasing the resource.
Selected intervals estimated at a 0.3g/t Au cut-off grade, including higher grade intervals reported at a 0.5g/t Au lower cut-off grade include:
Section 30600E include: ? 193m @ 1.7g/t Au from 40m in HEDD218 including 10.4m @ 5.5g/t Au from 42m ? 123m @ 1.9g/t Au from 33m in HMRC054 including 51m @ 3.8g/t Au from 88m ? 43m @ 0.9g/t Au from 62.7m and 75m @ 1.1g/t Au from 120m and 19.3m @ 1.1g/t Au from 303m in HEDD217 ? 136m @ 1.2g/t Au from 38m in HMRC055 including 93m @ 1.6g/t Au
Results on section 30520E include: ? 72m @ 1.9g/t Au from 36m in HMRC139 including 19m @ 3.7g/t Au from 68m and 32m @ 1.9g/t Au from 68m ? 153m @ 1.0g/t Au from 45m in HMRC140 including 13m @ 1.8g/t Au from 58m and 42m @ 1.3 g/t Au from 69m and 12m @ 1.6g/t Au from 129m ? 147m @ 1.0g/t Au from 45m in HMRC141 including 85m @ 1.3g/t Au from 63m ? 154m @ 0.9g/t Au from 62m in HMRC142 including 28m @ 1.2g/t Au from 86m and 60m @ 1.4g/t Au from 130m ? 94m @ 1.0g/t Au from 114m in HMRC298 ? 69m @ 1.5g/t Au from 176m in HMRC300
“These new resource definition drilling results at Brolga, including 193m @ 1.7g/t Au in diamond drill hole HEDD218, successfully demonstrate the continuity of mineralisation within the proposed Brolga Stage 1 starter pit and reduce project risk associated with early production,” General Manager Exploration, Phil Tornatora, said.
“Resource extension drilling to the southwest of the proposed Brolga starter pit is in progress. Exploration drilling continues across both Greater Hemi and Regional areas. Resource definition drilling is nearing completion and rigs will then be targeting further resource extensional and discovery drilling within the Greater Hemi region.”
