Lake Roe Project
The Lake Roe Project is located 100km east of Kalgoorlie in the Eastern Goldfields Superterrane, approximately 10km north of the Karonie gold deposit and 60km south-southeast of the Karari-Carosue Dam gold deposits. The project currently comprises five granted tenements and one application, comprising a total area of 556km2.
The main target at the Lake Roe Project is high-grade mineralisation hosted by the upper granophyric portion of a 400m-thick fractionated dolerite situated in a domal geometry in an area of shallow cover and geometrically above the Keith-Kilkenny Lineament. Supergene gold anomalism was identified by historic vertical rotary air blast and aircore drilling undertaken in the period 1991 to 1998. Although the gold potential of the area was identified by previous explorers, systematic follow-up of the results did not occur. Breaker recognised that the supergene mineralisation is largely confined to a dolerite, suggesting a possible local bedrock source. Visual observations, supported by selective geochemical sampling, indicate the dolerite is fractionated and therefore highly favourable for hosting gold.
An 87-hole, 3,187m wide-spaced aircore drilling program was completed in early August 2015 with all holes drilled to refusal (hard, near-fresh bedrock). The drill results indicate a significant new gold system (best intersection 20m at 1.93g/t Au (including 4m at 7.38 g/t Au)) with 1m end-of-hole samples anomalous in gold up to 1.03g/t, silver up to 0.99g/t and tungsten up to 0.79% over widths up to 300m. Twenty percent of the drill holes ended in mineralisation which is unusual for a greenfields program on such a wide drill spacing (80m or 160m).
The drilling identified two separate mineralised zones defined by end-of-hole sampling, termed the Lake Roe and Claypan Mineralised Zones (LRMZ and CMZ). The coherence and dimensions of the bedrock mineralisation – gold, silver and tungsten – on such a wide drill spacing is also unusual and indicates a mineralised envelope up to 300m wide. The LRMZ is best developed over a 2km-long zone to the south where it is open along strike. It has an overall strike length of 5.5km and is hosted by a fractionated dolerite in a similar setting to and along strike from the Carosue Dam gold and Karonie gold deposits. The CMZ extends over 2.5km on a sheared granite contact and is defined by two aircore traverses on a 160m drill hole spacing (open along strike).
The drill density of the August program was too low to outline the extent, geometry and dimension of the oxide mineralisation. Given the quality of the results and the wide drill hole spacing of the first pass drilling, two additional phases of aircore drilling were completed in the December 2015 quarter to test the continuity, density and extent of the gold mineralisation in the southern part of the system (Phases 2 and 3; Bombora Prospect). This drilling delivered many significant intersections over a wide area and 30% of the Phase 2 holes and 24% of the Phase 3 holes ended in +50ppb Au in relatively fresh rock with grades up to 12.87g/t gold.
Significantly, the drilling successfully clarified the broad controls on gold mineralisation, upgraded the geological continuity and enhanced the resource potential. Extensional drilling on a wider drill hole spacing extended the system to the south, identifying a new NE-trending structure in excess of 700m long with a best intersections of 4m at 3.88g/t Au and 2m at 5.56g/t Au. Importantly, the drilling demonstrated that the gold mineralisation occurs in a multiple, stacked configuration over a 2.2km x 1km area that is open in all dimensions. This significantly increases the potential ounces per vertical metre, enhancing the scope for possible open pit and underground mining.
A 36-hole, 6,500m reverse circulation drill program targeting discovery commenced on 9 February 2016. This program returned high-grade intersections of up to 1m at 19.33g/t in primary sulphide lode mineralisation. Other significant intersections include 10m at 2.78g/t, 7m at 2.86g/t, 4m at 5.08g/t, 3m at 5.23g/t and 2m at 7.58g/t.
A 359 hole, 7,807m aircore program was conducted during May 2016. Preliminary drill results identified 2.6km zone of strong, continuous gold and arsenic anomalism under thin (~5m) transported cover directly north of the Bombora discovery (4m composite samples). Geochemical style drilling identified gold grades up to 8.70g/t gold in end-of-hole samples and 43% of the 1m EOH samples ended in plus 50ppb gold mineralisation.
A ~4,000m program of reconnaissance RC drilling is planned to commence on 7 July 2016. After completion of the RC program, it is intended to undertake diamond drilling to clarify the detailed geometry of the gold mineralisation and its inter-relationships with structure, alteration and rock type.