Mount Laws Exploration
RC drilling at Mount Laws targeted untested gold mineralisation downdip of intercepts encountered in historical RAB and RC drilling. The RC drilling also tested below old gold workings and anomalous gold zones along the 1.5-kilometre Mount Laws gold trend where a number of high-grade gold results including rock chips assaying up to 28.6 grams per tonne gold were collected in early 2018 during surface sampling and mapping work.
The November 2018 Mt. Laws RC drilling program comprised 16 drill holes for 1,320 metres. Drilling was completed on 13 drill traverses that were spaced between 80 to 360m apart. Holes ranged in depths from 51 to 117m. Collar locations are shown in Figure x. Significant intercepts include:
- 4m @ 3.48 g/t Au from 75m (in hole WRC1816)
- 2m @ 3.32 g/t Au From 87m (in hole WRC1815)
- 2m @ 3.09 g/t Au from 49m (in hole WRC1807)
Drilling intersected a sequence of Banded Iron Formation within a dolerite and basaltic mafic sequence. Mineralisation is associated with a BIF and dolerite/basalt contact with trace amounts quartz veining and pyrite. Drill hole observations indicate that the BIF unit pinches out at depth, however the mineralisation continues down dip and is hosted wholly in a fine- grained dolerite. The mineralisation ranges in thickness from 1 to 4m and is open at depth.
The March 2019 RC drill programme comprised 9-holes for 984 metres targeting gold mineralisation at several of the Warriedar prospects which included Mount Laws, Lang’s Find and Reid’s Ridge. The gold assay results were received early in the June 2019 period and are discussed below.
Mineralisation at Mount Laws is associated with a contact between a thin BIF unit and the surrounding dolerite. At depth the coeval stratigraphy of the BIF unit is a black graphitic shale. The contact between the BIF unit and the dolerite hosts quartz veining and minor amounts of sulphides.
Drilling underneath intercepts from the 2018 RC drilling at Mount Laws intersected the mineralised unit which is located at the upper contact of the graphitic shale with the encompassing dolerite. The mineralized intersections are of a similar width, or slightly thinner than the 2018 intercepts. The best intersection from 2019 drilling at Mount Laws was 3m @ 2.77 g/t Au from 121m in hole WRC1905.
A long-section view of the Mount Laws mineralization reveals a shallow west-dipping plunge along the plane of mineralization with potentially open areas at depth. This long section interpretation utilizes historic drill data available for the Mount Laws mineralization and incorporates the recent drilling completed by Norwest in 2018 and 2019.
Additional drilling at Mount Laws included two holes to the west of the main Mount Laws area. These holes tested along-strike extensions to mineralization, as potentially indicated by anomalous rock chips from 2018 surface sampling programs. No significant assays were encountered.
Reid’s Ridge North Drilling
Historical review of data in the area of the Reid’s Ridge revealed a surface sample anomaly with no follow-up drilling located to the northwest of Reid’s Ridge. Ground reconnaissance and surface sampling on the site during the December 2018 field program confirmed the anomalous gold values in quartz veins within a massive granodiorite. Drill holes were planned based on the orientation of historic trenches and workings at the site.
The drill holes at the Reid’s Ridge north soil anomaly returned multiple thin zones of mineralization inconsistently located in quartz veins, in the granodiorite, or in thin units of potentially dolerite dykes. The holes additionally encountered minor base metal anomalism in conjunction with gold anomalism (2 m @ 0.31% Zn in hole WRC1909; 1 m @ 0.29% Cu in hole WRC1908).
Lang’s Find Drilling
One drill hole at Lang’s Find (WRC1907) to test for possible down dip extension of mineralization from surface sampling. The hole encountered several zones of quartz veining, including one within the expected BIF unit with moderate sulphide mineralization. Assays from this hole returned no significant intersections (> 0.5 g/t Au).