The Juglah Dome Gold Project covers an area of 157 km² and is located 57 km SW of Kalgoorlie, WA. Exploration in 2014 confirmed base metal targets. Pioneer’s recent exploration programs have focused on the 4 km long, Dingo Dam Prospect which is considered prospective for volcanogenic massive sulphide (“VMS”) silver lead-zinc mineralisation. The size and tenor of the anomaly is very encouraging and specific VMS-directed exploration programs will continue.
Pioneer commenced drilling September 2011 at its Juglah Dome Gold Project. The project presents an exciting group of new targets generated through combining the skills of the prospector with those of the geologist. The last modern exploration was conducted some 10-15 years ago, where gold-in-soil geochemistry anomalies were successfully identified, but subsequent drilling failed to resolve a source for the gold.
Since the tenement's grant, Pioneer has completed mapping and additional soil geochemistry, but importantly the project's advancement has been greatly aided by a party of APLA-registered Kalgoorlie- based prospectors.
Over twelve nugget patches have been identified. When this information is combined with conventional gold (Au) and pathfinder element (copper (Cu), arsenic (As)) soil geochemistry; and then overlain on aeromagnetic imagery showing geological structures, a number of coincident targets are evident, and these are rated highly by Pioneer's geologists.
While mapping, rock chips were taken from an outcropping quartz vein. Three samples with visible gold were not submitted, however of 9 others, 5 returned gold values between 3.06g/t and 711g/t.
VMS mineralisation is generated by hydrothermal processes and may have accumulated along stratigraphic horizons within piles of volcanic or volcanoclastic lithologies, near vents during breaks in violent volcanic activity.
When exposed to weathering, Ph-Zn mineralis degrade rapidly and Pb in particular quickly disperses within the regolith. This means that exploration for VMS deposits relies heaviliy on the recognition of trace level multi-element geochemical associations and mineral alteration assemblages. Within Western Australia's Yilgarn Craton, when exploring for VMS Pb-Zn systems, clusters of Pb values above 50pp are therfore considered significant. The anomaly increases in importance when detectable quantities of silver and cadmium co-occur.
Examples of volcanogenic massive sulphide deposits within the Archaean shield of Western Australia, include, Nimbus (40 km northwest - Macphersons Resources MRP), the Teutonic Bore VMS system including Jaguar and Bentley Deposits (Independence Group IGO) and the Golden Grove Mine (MMG Limited)
Dingo Dam polymetallic geochemistry targets
The Dingo Dam geochemical anomaly exhibits a zoned, polymetallic response. The geochemistry interpretation shows a zoned base-metal, gold and pathfinder element anomaly extending for over 1.2 km.
Trace and pathfinder elements include:
- a central bismuth core surrounded by anomalous gold;
- a northerly copper zone with associated molybdenum; and
- a southern lead-zinc zone with associated cadmium, antimony, and mercury.
A program of 15 shallow proof-of-concept RC drill holes, undertaken to test a Cu-Au-Ag gossan and encompassing soil geochemistry anomaly, has resulted in 4 holes intersecting anomalous mineralization, including:
- JDRC003 1m at 2.33% Cu and 41g/t Ag (0.3g/t Au, 1004ppm Pb and 1884ppm Zn)
- JDRC009 2m at 1.02% Cu and 0.88g/t Au
Mineralisation is interpreted as a tabular body, dipping steeply and plunging towards south. Where it was intersected, mineralisation was strongly weathered, however is likely to be sulphidic in fresh rock, and therefore detectable by an electromagnetic survey. Future drilling will test for the interpreted southerly plunge for the mineralisation.
Aircore Drilling returned geochemically anomalous Pb, Zn plus a suite of other elements considered indicative of a Volcanogenic Massive Sulphide (“VMS”) system. All samples were from shallow, weathered rock. These included:
- JDAC001 13m at 1475ppm Zn and up to 1475ppm Pb (Au up to 169ppb, Ag up to 6.7g/t)
- JDAC002 8 m at 1499ppm Zn and up to 978ppm Pb (Au up to 160ppb, Cd up to 8.7ppm)
- JDAC009 11 m at 1356ppm Zn and up to 3233ppm Pb (Au up to 500ppb, Ag up to 5.8g/t)
The 12 aircore holes drilled across 2 poly-metallic soil geochemistry anomalies effectively ‘confirmed the concept’ that a VMS environment has been identified. Each drill hole halted when hard, often fresh rock was encountered. 8 holes intersected anomalous Pb-Zn results.
VMS mineralisation forms along specific stratigraphic horizons within piles of volcanic or volcanoclastic lithologies. The prospective horizons represent breaks in volcanic activity, and during this time hydrothermal processes may result in the accumulation of deposits of sulphides which may include sphalerite (Zn sulphide) and galena (Pb sulphide) near volcanic vents.
Pb and Zn minerals degrade and often disperse as host rocks weather to form the regolith, which is a wide-spread phenomenon in Western Australia. This means that exploration for VMS deposits relies extensively on the recognition of specific multi-element associations which may be in trace amounts, but elevated relative to background, within a specific geological setting and exhibiting specific mineral alteration assemblages.
Within Western Australia’s Yilgarn Craton, when exploring for VMS Pb-Zn systems, clusters of Pb values above 50ppm, such as those evident at Dingo Dam, are considered significant. The anomaly increases in importance when detectable quantities of silver (Ag) and cadmium (Cd) co-occur.
The 3 RC holes intersected further anomalous supergene Pb-Zn mineralisation however no primary mineralisation has been intersected to date.
The most significant result was returned from:
- JDRC002, 4m at 1748ppm Pb (and up to 1394ppm Zn (Ag up to 5.7g/t, Cd up to 14.8ppm).
Early indications are that primary mineralisation may dip towards the east.
Examples of volcanogenic massive sulphide deposits within the Archaean shield of Western Australia include Nimbus (40 km northwest (Macphersons Resources Limited ASX: MRP), the Teutonic Bore VMS system including the Jaguar and Bentley Deposits (Independence Group NL ASX: IGO) and the Golden Grove Mine (MMG Limited).
Golden Shovel Prospect (E25/514) provides strike extensions
Archived records show activities on exploration licence application E25/514 included rock chip sampling, RAB and RC percussion drilling, and one diamond drill hole at the Golden Shovel Prospect. The rock chip sampling, and follow-up drilling identified high grade gold mineralisation.
Moonbaker Gold Target
Two RC holes were completed to test for gold mineralisation at the Moonbaker Prospect. Anomalous results included:
- JDRC019 - 3m at 1.70g/t Au
- Further geophysical surveys. These may include EM or Induced Polarisation (“IP”) methods to detect higher grade and deeper VMS - sulphide mineralisation;
- Campaigns of RC drilling will be completed as targets are resolved.