Yarri Project


The Yarri Project comprises granted licences and applications covering approximately 1,300km2. The Project is approximately 150km northeast of Kalgoorlie between the Keith-Kilkenny Tectonic Zone (KKTZ) and the Laverton Tectonic Zone (LTZ).

Yarri Project - Tenement Location

Hobbes Prospect

The Hobbes Prospect is within Licence E31/1117 (OreCorp earning up to 80%) covering a portion of the Edjudina Greenstone Belt, Pig Well Graben and north-northwest trending KKTZ within the Kurnalpi Terrane of the Archaean Eastern Goldfields Province. The gold mineralisation within the licence is preferentially hosted within the older volcaniclastic, andesite and carbonated mafic units commonly associated with  porphyry intrusives. 

Historical drilling intersected primary mineralisation beneath the supergene zones. OreCorp completed a maiden reverse circulation (RC) drilling program of 17 holes at the Hobbes Prospect designed to confirm and test the strike length, depth potential and lateral continuity of both the supergene and primary gold mineralisation and returned encouraging results. Better intercepts include:

  • HOBRC0001: 12m @ 1.49g/t gold from 58m; Incl. 4m @ 3.39g/t gold from 64m
  • HOBRC0002: 22m @ 3.22g/t gold from 45m
  • HOBRC0009: 9m @ 2.85g/t gold from 176m; Incl. 3m @ 5.13g/t gold from 182m (end-of-hole)
  • HOBRC0014: 30m @ 1.08g/t gold from 47m; Incl. 14m @ 1.25g/t gold from 47m and 8m @ 1.27g/t gold from 68m

Gold mineralisation at Hobbes is typically hosted within a shallow, sub horizontal supergene blanket generally 45-65m below surface with a vertical thickness up to 30m (using a 0.25 g/t lower cut). This blanket lies above primary mineralisation, hosted in subvertical north-northwest striking structures in chlorite-carbonate-silica altered intermediate epiclastic volcanic rocks.

The drill program outlined broad zones of supergene mineralisation at least 1km along strike and >400m across strike and open in all directions.

Hobbes Prospect - Drilling

Hobbes Prospect - Drilling

Hobbes Prospect - Cross Section

Choirboy Prospect

The Choir Boy Prospect is located within E39/1914, the Choirboy Prospect is associated with a mylonitic shear zone defined by tectonic cherts and quartz veins within a sequence of felsic metasedimentary schists, graphitic and sulphidic shales.  Historical drilling, including 14 RC holes and 74 RAB holes, on nominal 100m line spacing, has defined a north-south mineralised zone interpreted by previous operators as dipping shallowly to the east, over a strike length of >800m. Better RC intercepts (using a 0.5g/t cut off) include:

CBP001 - 8m @ 1.66 g/t Au from 0m
CBP007 - 4m @ 3.66 g/t Au from 42m
CBP008 - 15m @ 0.95 g/t Au from 61m
CBR014 - 2m @ 5.07 g/t Au from 47m
CBR022 -12m @ 1.31 g/t Au from 25m

Results from systematic rock-chip sampling completed by OreCorp are encouraging and correlate closely with the gold mineralised zones in historical drilling. Fifteen samples with grades > 1.0 g/t Au (range 1.04–19.65 g/t Au) defined a continuous Ridge Zone of high grade gold mineralisation over 320m of strike and up to 16m width. A high grade sample of 3.56 g/t Au was returned from a sample line 250m south of the Ridge Zone, which defines discontinuous gold mineralisation with a strike length of up to 570m. Gold mineralisation is variably associated with the fault-breccia, chert and volcaniclastic schist units.

Choirboy Prospect - Rock Chips

The Gap Prospect

Located approximately 1.3km northeast of Choir Boy within E39/1914, The Gap Prospect comprises of a series of prominent parallel banded iron formation (BIF) ridges that strike north-northwest, south-southeast through the centre of the licence. Between the BIF ridges is a quartz-mica schist with subordinate amounts of mafic schist. Strongly silicified fault-breccia with abundant quartz veining, sub-parallel to bedding, occurs along the peak of the east BIF ridge.

Rock-chip samples collected from the fault-breccia unit over approximately 230m of strike returned results ranging from 0.02–2.68 g/t Au, with samples >1.0 g/t Au extending discontinuously over at least 180m of strike. These initial reconnaissance results are very encouraging and warrant further work to determine the extent of surface mineralisation and relationship of the mineralisation to the various rock types and structure.

Jericho Prospect

Located within P39/5600, the Jericho prospect is an early stage target defined by a semi-continuous gold-in-soil anomaly covering an area of 1,200m x 100m, peaking at 522 ppb Au. The anomaly predominantly overlies felsic metasediments and volcaniclastics to the east and west of a prominent BIF ridge which trends north-northwest and dips steeply to the east. The anomaly has been lightly tested by 14 RAB holes on ~200m line spacing, with maximum downhole intercepts of 1m @ 1.7 g/t Au and 1m @ 1.3 g/t Au in holes RCRB0059 and RCRB0038 respectively.

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