De Grey Mining Limited (ASX: DEG) has received “outstanding” resource definition and resource extension results from the Diucon deposit at the world class Hemi gold discovery in Western Australia.
The gold mineralisation at Diucon shows similar alteration and sulphide development as seen at the adjacent deposits of Aquila, Brolga, Crow, Falcon and Eagle. Drilling at Diucon and Eagle has intersected broad zones of mineralised intrusive in resource definition and extensional drilling including late high-grade mineralisation associated with quartz-carbonate veining, sericite-albite alteration and visible gold.
The mineralised intrusion at Diucon has now been intersected to 300m in width, 550m depth and over 1,000m along strike and remains open in all directions.
Ongoing drilling at Diucon and other deposits at Hemi demonstrates potential to increase gold endowment through increased grade and extensions to the maiden mineral resource estimate (MRE).
Resource definition drilling to a nominal 40m x 40m spacing above approximately 400 vertical metres is currently being prioritised to increase the resource confidence level from JORC Inferred to Indicated in areas of Diucon proposed to be mined by open pit methods.
Resource definition drilling for the PFS will continue into the first quarter of 2022. Resource extension drilling at Diucon and the other deposits at Hemi will continue throughout 2022.
The resource definition results at Diucon have continued to intersect broad deposits of mineralisation including high grade intervals near surface,” General Manager Exploration, Phil Tornatora, said.
“New results include 148.6m @ 2.0g/t Au including 8.9m @ 7.3g/t Au and 34.8m @ 2.9g/t Au in HEDD064. This and other recent intersections are expected to have a positive impact on the Diucon resource grade and PFS mine schedule.
“The new extensional result at Diucon in HERC775D of 128.9m @ 1.5g/t Au including higher grade intervals is located approximately 100m beneath the Scoping Study open pit design.
“New pit shell optimisations will be conducted in the PFS aiming to increase gold production from the Diucon pit.
“Diamond drilling at Hemi will pivot to resource extension and discovery drilling after the March quarter and these new results at Diucon provide encouragement.
“Exploration with aircore and RC drilling continues to be conducted in the Greater Hemi region outside the Hemi footprint seeking new near surface gold bearing intrusions.”
New resource definition drilling results include:
- 148.6m @ 2.0g/t Au from 92.0 m including 8.9m @ 7.3g/t Au from 101.0m and 34.8m @ 2.9g/t Au from 129.3m
- 8.0m @ 5.0g/t Au from 131.0m and 71.1m @ 3.5g/t Au from 188.0m including 38.1m @ 6.2g/t Au from 221.0m
- 64.0m @ 3.7g/t Au* from 259.0m
- 152.5m @ 2.3 g/t Au from 53.0m including 25.0m @ 4.4g/t Au from 106.0m and 6.3m @ 25.7g/t Au from 135.4m
- 104.0m @ 1.2g/t Au from 151.8m including 33.2m @ 2.3g/t Au from 151.8m
New extensional drilling results include:
- 128.9m @ 1.5g/t Au from 340.0m, including 26.3 @ 2.3g/t Au from 341.0m and 43.9m @ 2.2g/t Au from 374.1m and 9m @ 2.4g/t Au from 441.0m.
