De Grey Mining Limited (ASX:DEG) has received encouraging results from drilling at the Mallina deposit in WA’s Pilbara region which are likely to add to the existing 160,700-ounce resource.
Mallina forms part of the company’s broader Pilbara Gold Project near Port Hedland, which hosts a growing 1.4 million-ounce resource.
A program comprising four diamond tails for 464 metres and 15 reverse circulation (RC) holes for 1673 metres has been completed at Mallina with results extending mineralisation along strike beyond the existing resource.
More results expected
Results for the RC drilling, one of the diamond holes and the pre-collars of the three other diamond holes have been received with more results expected this month.
Best results are:
- 4.93 metres at 1.23 g/t gold from 106.32 metres, including 1.19 metres at 3.73 g/t from 109.17 metres;
- 5 metres 2.04 g/t from 81 metres;
- 6 metres at 1.29 g/t from 70 metres, including 1 metre at 5.66 g/t from 70 metres;
- 11 metres at 1.05 g/t from 101 metres, including 2 metres at 2.66 g/t from 106 metres;
- 14 metres at 1.05 g/t from 130 metres;
- 8 metres at 1.23 g/t from 62 metres, including 2 metres at 3.08 g/t from 65 metres; and
- 14 metres at 1.59 g/t from 75 metres, including 4 metres at 3.17 g/t from 77 metres.
The RC drilling targeted a number of selected lodes with step out extensions both along strike and down dip.
An intersection of 5 metres at 2.03 g/t was intersected in one hole, which was a 50-metre step out to the west of the current resource in the Mallina Central Zone.
These holes and planned follow-up drilling is expected to add to the current Mallina resource base.
An additional two diamond holes drilled for metallurgical purposes have been partially assayed and are undergoing metallurgical test work with final results pending.
SAM survey underway
De Grey has started a 5x1 kilometre detailed Sub-Audio Magnetic (SAM) geophysical survey, which is expected to finish in about 1-2 weeks.
This is designed to provide greater ability to target along strike extensions by providing more confidence in the lateral extents of the controlling mineralised structures and allow for larger drill programs to be designed going forward.
These larger drill programs are expected to enable larger and more rapid resource extensions to be defined.
Further resource extension drill programs are to be planned based on the results of the SAM survey and the pending diamond core.