Mulwarrie Gold Project

Western Australia

The Mulwarrie Gold Project is located 150km north-west of Kalgoorlie in the Ularring District of the North Coolgardie Mineral Field. The project encompasses two contiguous tenements, M30/119 (68 Ha) and M30/145, which lie 10km north-west of the Davyhurst Mining centre.

Figure 3: Location, Mulwarrie project

The two tenements lie within a 10km wide greenstone belt which forms the north-west extension of the Coolgardie Line. The structurally dominant, north-trending Mt Ida fault lies approximately 4km east of the Mulwarrie Mining Centre. Most of the lithologies within this greenstone belt are steeply-dipping and well foliated along a NNW/SSE trend.

Figure 4: Mulwarrie tenements and simplified geology

Grades of metamorphism at Mulwarrie are generally higher than in the Kalgoorlie area with hornblende – biotite – plagioclase amphibolites common. Hornblende is diagnostic of the amphibolite facies and at Mulwarrie metamorphism has peaked at mid to upper amphibolite facies.

Gold mineralisation has been found in two distinct settings at Mulwarrie: –

  1. In narrow shear zones with only minor or no quartz veining, with limited calcsilicate alteration haloes and with erratic but occasionally high gold values. These zones of mineralisation may be up to 2m wide but are generally less than 50cm. They are conformable to the stratigraphy and foliation; and
  2. The second and most important type of gold mineralisation is associated with quite flat-dipping, often massive quartz reefs with strong diopside, biotite, epidote and carbonate alteration haloes. Pyrrhotite and pyrite development is also strong within and adjacent to the quartz reefs. Minor amounts of chalcopyrite, galena and sphalerite are also associated with gold mineralisation. Gold is found within quartz reefs, within biotite selvages to the quartz veins and also in the associated country rocks.

Spitfire had early drill success at Mulwarrie, with significant gold mineralisation discovered directly below and along strike from historical open pit. The Company’s maiden 3,015m Reverse Circulation and diamond drilling program, completed in June 2017, intersected thick zones of primary gold mineralisation both down-plunge and along strike from the historical Mulwarrie Central open pit:

  • 17MWRC008         30m @ 16.87 g/t Au from 56m, including:        

                    4m @ 118 g/t Au from 73m

  • 17MWRC010         7m @ 19.96 g/t Au from 53m; and

                   12m @ 2.65 g/t Au from 65m

  • 17MWRC012         23m @ 3.7 g/t Au from 70m, including:

                   4m @ 14 g/t Au from 70m

  • 17MWRC003         2m @ 10.86g/t Au from 31m                                   
  • 17MWRC014         9m @ 4.13 g/t Au from 137m including

                   1m @ 16.54 g/t Au from 137m

  • 17MWDD001        23m @ 7.27 g/t Au from 53m, including

                   9.5m @ 16.26g/t Au from 63m

  • 17MWRC018         4m @ 8.69 g/t Au from 67m;
  • 17MWRC019         7m @ 22.66 g/t Au from 97m including

                   1m @ 133 g/t Au from 97m, and

                   5m @ 2.39 g/t Au from 121m

  • 17MWRC024         4m @ 8.84 g/t Au from 87m

A follow-up drilling program, completed in September 2017, returned further outstanding results, confirming the presence of significant high-grade primary gold mineralisation below and along strike from historical gold mining areas.

The recent drilling has confirmed the continuity of the high-grade East lode over 75m down-plunge and open at depth, with significant intercepts including:

  • 17MWRC041         5m @ 20.75 g/t Au from 114m; including

                   2m @ 48.25 g/t Au from 114m,

  • 17MWRC045        4m @ 13.46 g/t Au from 57m; and

                  10m @ 4.58 g/t Au from 71m, including:

                  2m @ 14.77 g/t Au from 75m

  • 17MWRC047        3m @ 43.52 g/t Au from 72m; including

                  2m @ 64.73 g/t Au from 72m

The drilling results from the southern zone have extended the high-grade zone to depths below 100m, and highlighted new zones of mineralisation in the hanging wall. Significant assay results include:

  • 17MWRC097        9m @ 3.12 g/t Au from 101m; including

                  2m @ 9.29 g/t Au from 102m, and

                  12m @ 14.66 g/t Au from 123m; including

                  4m @ 36.97g/t Au from 127m

  • 17MWRC099        3m @ 30.57 g/t Au from 30m;
  • 17MWRC100        2m @ 4.10 g/t Au from 25m; and

                  3m @ 23.27 g/t Au from 102m, and

                                3m @ 6.46 g/t Au from 116m