Apollo Hill is located 60km southeast of Leonora, Western Australia, and the 100% Peel owned project comprises over 940km2 of granted tenure and applications. Two main gold deposits define the Apollo Hill deposit; Apollo Hill Main Zone and the Ra Zone. Both deposits exhibit the hallmarks of a major mineralised Archean gold system, showing extensive and intense hydrothermal alteration and deformation.
Apollo Hill was discovered in 1986 by Fimiston Mining Limited during a drill program aimed at finding the source of abundant eluvial gold at the base of a prominent hill in the area. Active drilling since then has outlined extensive gold mineralisation and alteration over a 1km strike length, which is up to 250m wide and dips 45-60 degrees to the east.
Located in the Archean aged Norseman-Wiluna Belt, Eastern Goldfields Province of the Yilgarn Craton, the Apollo Hill deposit occurs in a mineralised structure associated with the 1km wide Apollo Shear zone, a component of the Keith-Kilkenny Fault system. Strongly deformed felsic volcanoclastic rocks lie to the west of the Apollo shear, with relatively undeformed pillow basalt and dolerite to the east. Zones of mylonitisation, shearing, brecciation and fracturing caused by the shear is present along the contact, and resulting open space structures are favourable for trapping ore fluids and forming ore deposits. Secondary and tertiary structures generated from the major NNW striking faults and shear zones in the region produce brittle to ductile dilational zones that commonly contain ore deposits.
Multiple gold mineralisation events are interpreted to have occurred at Apollo Hill during a complex deformational history. Gold mineralisation is accompanied by quartz veins and carbonate-pyrite alteration associated with a mafic-felsic contact.
Work to date
In late 2012, Peel acquired Mining Licence M39/296 from Birimian Gold Limited; the tenement is immediately along strike to the southeast from the Apollo Hill resource and is considered to have excellent potential to host additional gold resources. Field reconnaissance has been completed on the licence by Peel, and a number of prospects have been identified for follow-up. An Aboriginal Heritage survey has already been completed to clear areas identified for exploration work.
In November 2013, an RC drilling program comprising of 11 holes was completed at the Apollo Hill deposit to test for extensions to the main mineralised zone. Results indicated the presence of mineralisation extending to the south-east of the inferred resource at Apollo Hill Main Zone, with an evident continuation of quartz veining and ankerite alteration within the felsic schist-meta basalt contact that has been associated with the bulk of mineralisation at Apollo Hill to date. Significant intercepts include:
- 21m @ 1.27 g/t Au from 91m (incl. 5m @ 4.22 g/t Au from 91m) in PARC22
- 8m @ 1.33 g/t Au from 123m and 2m @ 2.79 g/t Au from 101m in PARC25
- 25m @ 0.62 g/t Au from 37m (incl. 5m @ 1.18 g/t Au from 45m) in PARC32 in the Ra Zone
Drilling recommenced at Apollo Hill in November 2014, with 23 aircore (AC) holes completed along strike from the main Apollo Hill deposits; four traverses were completed to test for a northern extension of the Ra Zone, whilst 7 AC holes were completed within M39/296 to test for mineralisation to the SE of the main Apollo Hill resource. Encouragingly, the northern-most line of holes from the Ra Zone returned significant results, potentially extending mineralisation further to the north-west. Significant intercepts include:
- 2m @ 1.24 g/t Au from 33m in PAAC01
- 8m @ 0.27 g/t Au from 38m to EOH (incl. 1m @ 0.64 g/t Au from 39m) in PAAC02
- 2m @ 0.61g/t Au from 25m (incl. 1m @ 0.91 g/t Au from 26m) and 2m @ 0.72 g/t Au from 29m to EOH (incl. 1m @ 0.93 g/t Au from 29m) in PAAC03
- 1m @ 1.51 g/t Au from 21m in PAAC04
- 1m @ 3.36 g/t Au from 6m and 1m @ 0.69 g/t Au from 9m in PAAC15
- 1m @ 1.15 g/t Au from 0m and 1m @ 0.5 g/t Au from 4m in PAAC21
An RC drilling program has since been completed at Apollo Hill in early 2016, comprising 7 new drillholes and an extension to existing hole PARC31. High grade gold mineralisation was encountered, increasing the known strike of the Apollo Hill main zone by up to 250m to the southeast, indicating good potential to add to the existing resource. Extensional intercepts include:
- 8m @ 6.39 g/t Au from 71m (incl. 3m @ 15.6 g/t Au from 74m) and 10m @ 4.23 g/t Au from 94m (incl. 5m @ 6.31 g/t Au from 95m) in PARC036
- 28m @ 0.86 g/t Au from 207m in PARC31.
Infill drilling results in the southeast portion of the resources were also positive:
- 1m @ 8.09 g/t Au from 47m and 1m @ 4.77 g/t Au from 120m in PARC037
- 5m @ 1.56 g/t Au from 19m, 1m @ 4.4 g/t Au from 53m, 1m @ 5.20 g/t Au from 95m, 1m @ 4.23 g/t Au from 113m, 1m @ 19.55 g/t Au from 142m and 1m @ 8.50 g/t Au from 162m in PARC038.
Three of the seven holes from the program were collared to test for down-dip extensions to mineralisation in the central and southern part of the Apollo Hill main zone area and multiple mineralised intervals were intercepted in all:
- 10m @ 0.76 g/t Au from 214m in PARC033
- 5m @ 1.71 g/t Au from 209m, 1m @ 7.51 g/t Au from 246m and 1m @ 42.77 g/t Au from 287m in PARC034
- 12m @ 0.85 g/t Au from 258m in PARC035
Further drilling is anticipated to follow-up these encouraging results.
Additional activities at the main zone have comprised of the sampling and assaying of historic drill core. Diamond drilling completed by Apex Minerals NL in 2006 had returned significant mineralised zones including 1.26m @ 21.12 g/t Au from 192.74m in AAHD0002, 1.3m @ 14.46 g/t Au from 96.7m in AAHD0004, 2m @ 69.26 g/t Au from 146m in AAHD0010. However, numerous sample gaps were present, with many in close proximity to high grade Au intervals as well as the ends of drillholes. The latest assays further substantiate the Apollo Hill resource model with intervals such as 1m @ 6.74 g/t Au from 165m in AAHD0004, 1m @ 2.91 g/t Au from 225m in AAHD0010, 2m @ 1.18 g/t Au from 148m in AAHD0014, 1m @ 2.59 g/t Au from 400m and 1m @ 3.60 g/t Au from 417m in AAHD0020.
Regional exploration activities throughout Peel’s extensive WA tenure have delineated multiple targets that warrant further investigations. A promising area is the ’40G’ prospect; located on E31/1063 to the SE of the main Apollo Hill resource. Preliminary geochemical sampling showed the area to be highly anomalous in gold (max. 42.9 g/t Au) and follow-up RAB drilling continued to highlight the prospectivity of the area with intercepts such as 2m @ 0.53 g/t Au from 9m in 40GRAB03, 2m @ 1.32 g/t Au from 16m and 2m @ 2.11 g/t Au from 22m in 40GRAB12, and 1m @ 1.09 g/t Au from 18m in 40GRAB17. Auger and rock chip sampling has since extended coverage to the north, south and east of the RAB drilling, with anomalous gold values returned towards the east along an interpreted NE trending magnetic structural feature. RC and diamond drilling is warranted to test whether mineralisation hosting structures exist beneath the geochemical anomalies.