Brilliant Brumby Update April 2018
The Brilliant Brumby technical team has stockpiled over 4,000 tones of high grade ore to date. The team are well on their way to stockpiling an initial 10,000 tons allowing an ore processing plant to commence gold production soon thereafter.
Please see a collection of recent photos from InterGroup Mining’s fast-developing Brilliant Brumby project in North Queensland.
Brilliant Brumby Update June 2017
A Progress Summary Report for 6 May to 16 June 2017 has been released to illustrate the current development with Brilliant Brumby.
Please see Progress Summary 6 May to 16 June 2017 clicking the link below.
Recent development on the Brilliant Brumby infrastructure includes road construction and access to the mining lease. Please see more project update photos by clicking the link below.
Brilliant Brumby Highlights
Very high gold values have been returned from both rock chip and stream sediment reconnaissance sampling of the Brilliant Brumby and other gold bearing vein systems. Some of these results come from previously unrecognized siliceous outcrops. Result highlights include:
Highly encouraging Au in rock chips returned from 2km strike length. The highest gold values come from narrow quartz veins, generally 0.2m-0.3m wide, these occur in siliceous alteration zones up to 10m wide. Several samples returned >10 g/t Au with highest values of 95 g/t Au and 176 g/t Au (almost 6 ounces Au to the tonne). Coarse visible gold was noted as flakes within the quartz vein.
Surprise – Loafer: Several samples returned >5 g/t Au from 0.25m wide quartz vein. Possible extension of this system to 130m strike length.
Sundown – Possible extension of this 0.2m wide vein system to 100m of strike length. Au in the 0.5 g/t
Au to 5 g/t Au range returned.
Stallion – New discovery of a siliceous granite breccia 80m x 70m named the Stallion prospect. Au assays to date are low.
West Brumby – New discovery of a brecciated granite outcrop west of Brilliant Brumby (close to western boundary of the tenement) assays received in the 8 – 10 g/t Au range.
Early Bird – Historic workings on narrow 0.25cm vein returned gold to 3 g/t Au range. Gold also returned from nearby outcrops of quartz vein material in the 0.5 g/t to 1.7 g/t Au range.
Golden Spur – Occidental: hard rock workings not located in spite of intensive searching.
Stream Sediment Sampling: Sampling was designed to follow up previously recorded high values.
Extremely high Au values were returned from follow up of previous high Au in BCL’s from the Early Bird prospect.
In drainages south of Early Bird area sampling near the site of a previous 240ppb Au BCL result returned extremely high 6790ppb Au. -80 mesh sieved stream sediment sampling from the same site returned 171ppm Au in fire assay. Nearby another high sample of 4.78ppm was returned.
Location & Access
The tenement is located 20 kilometres north of the township of Pentland on the Flinders Highway west of Charters Towers, in north Queensland. Access is by an unsealed track which leaves the Flinders Highway 3 kilometres west of the Cape River Bridge and runs northwest to Mount Stewart homestead.
Areas of Focus
Mineralisation at the Brilliant Brumby Mine is hosted by quartz veining trending north-south, in contrast to the general NE-SW trend of major faults and lineaments.
Reconnaissance field work further defined the Brilliant Brumby prospect through detailed geological and structural mapping. The work showed that the zone of mineralisation consisted of a series of en echelon veins and vein zones offset by a series of parallel faults arranged along a common line of bearing of 355° true.
Rock chip assay returned encouraging gold results; to the north of Brilliant Brumby within a zone of quartz veins, rock chip sample 3014337 taken from a 0.3m wide quartz vein returned 16.25g/t Au and re-assay returned 25.5 g/t.
Sampling from southern Brilliant Brumby area again confirmed presence of gold with anomalous assay results. Within the old deep workings, a zone of quartz veining thickened to approximately 10m wide, a sample collected from Run-of- Mine (ROM) ore heap had the highest gold value of 176 g/t Au. Just south the quartz veins range in thickness from 1-50cm within a vein system approximately 15m thick, however further observations noted slickensides suggesting post mineralisation faulting has occurred, such cross faults could account for the zone thickness.
Around historic underground working and trenches at observation points BB016 and BB017, vertical and sub-vertical quartz veins were orientated at 150-155o within a 2m wide zone. A sample collected from a 25cm wide sub-vertical quartz vein, returned 95.7g/t Au and re-assay 87.6g/t Au.
The Surprise Mine is a prospect that appears to have not been worked for many years. The workings are of limited strike extent but alteration exists over a reasonable width, in the order of 50 m. The alteration zone was found to carry 0.16 g/t Au, the quartz 1.07 g/t Au.
Two samples were collected from the Surprise workings (BB032, BB033); sample 3014333 taken from 1m quartz vein cross cutting deeply weathered granite returned 7.41g/t and re-assay 8.99g/t. Sample 3014332 taken from a 15cm vein outcrop within alternation zone in a historic costean only returned 0.1g/t; an additional channel sample (3014383) was collected from across the quartz vein and granite margins returned 0.76g/t.
The Sundown workings appear as a quartz vein network approximately 1m wide, hosted within granite. The granite displays mild alteration with possible pyrite pseudomorphs. Individual milky white quartz veins range in thickness from 1-25cm and the visible workings extend approximately 50m. Sample 301406 taken from veins around the old workings returned 0.55g/t Au.
This prospect are has been named “Stallion” to be consistent with other names in the project area. Geological prospecting identified a silicified granite breccia containing up to 10% weathered sulphide. The area of brecciation extended approximately 80 m x 70 m, covering an area of approximately 2800 m2. Three samples were taken however assay results were not encouraging as no gold was detected.
This prospect is located west of Brilliant Brumby along the western boundary of the tenement. A brecciated granite outcrop was observed and sampled with assay giving 9.98g/t and re-assay 8.93g/t. More breccias outcrops were located along the ridge near tenement boundary, with possible cross fault shifting the breccias to adjacent ridge. Samples were taken along the ridge but they did not yield any gold from assay results.
The Early Bird prospect is a large magnetic low adjacent to regional NNE trending, deep seated fault which may indicate an area of alteration within the granite and adjacent to two inactive gold occurrences (Early Bird in north and Unnamed in south). The Early Bird workings are a collection of mine shafts and trenches following a quartz vein of approximately 40cm thickness. The workings extend approximately 20m in length. The veins cross cut sericite altered granite and contain visible traces of pyrite and galena. Sample 3014353 was representative of this and returned 3.24g/t Au, 42ppm Cu and 185ppm Pb. Several samples taken from outcropping veins along the hillside, all samples detected gold, with the most encouraging results being 1.75g/t Au in sample 3014354 and 2.43g/t from sample 3014356.
This target area is a cluster of previous artisanal gold workings, including Occidental and Golden Spur at the margin of a magnetic high related to the intrusion of the Permian Mundic Igneous Complex. The general area was accessed by vehicle along Allandale station track; however on the ground access was hampered by long grasses and big drops into valleys that could not be safely crossed. Numerous granite outcrops and some pegmatites were observed, but despite a reasonable area being traversed, the old workings could not be located. No rock chip samples were taken from this area.
Stream Sediment Anomalies
Stream sediment samples were taken primarily to test areas where historic sampling had returned anomalous gold. The -80 mesh results ranged from 2ppb to 171000ppb gold.
Within the drainage south of Early Bird prospect, historic results had identified a stream sediment sample anomaly of 240ppb Au from BCL sampling. On visiting the area observation BB044 noted that abundant quartz float in the river could be the source of gold and was sampled to test potential. Sample 4024023 returned 171ppm Au from -80 mesh sampling and just south, in the same catchment area sample 4024025 was taken from pink grey biotite granite outcrop in stream and returned 4780ppb Au from a -80 mesh sample. BCL Sample results confirmed the anomaly, returning 6790ppb Au from the same site as the -80 mesh sample.
The majority of the area is underlain by granitoids of the Lolworth Igneous Complex. This is regarded as a postorogenic batholith. It consists mainly of massive biotite adamellite and granodiorite, but a zone of banded pegmatitic and aplitic garnet-muscovite granite and adamellite occurs on the eastern margin. Dykes of garnetiferous muscovite pegmatite, granite and aplite are abundant within the complex. The age of the complex has been radiometrically dated as ranging from Upper Silurjan to Lower Devonian (Vine and Paine, 1974).
In the northeast corner of the EPM, the Mundic Igneous Complex intrudes the Lolworth Complex. This complex is a group of subvolcanic stocks, bosses, dykes and minor volcanics. The main body is a microgranite epizonal stock forming Mt. Stewart, while a small micro—adamellite boss falls on the eastern boundary of the EPM. The complex probably is the source of gold and minor base metal mineralisation at Mt. Stewart and Lolworth to the north of the Authority.
Both the Lolworth and Mundic Igneous Complexes are overlain by the Tertiary (Pliocene) Campaspe Beds. The Campaspe Beds comprise clayey and gritty sandstone, conglomerate and siltstone. The presence of fossil alluvial gold near the base of the Campaspe Beds in the Cape River Deep Lead suggest that these outcrops should be regarded as a prospective target for gold exploration.
The Brilliant Brumby EPM is centered over a prospective portion of Pentland District and includes several precious metal (Au-Ag) historic mines and advanced prospects which have received sporadic exploration over the past 25 years.
Major historical and exploration results to date are:
The Brilliant Brumby Mine was discovered and worked from 1937 to 1940, and sporadically thereafter in 1947 and 1961. Total recorded production is 790 ozs (24.6 kg) from 950 tons of ore. Mineralisation at the Brilliant Brumby Mine is hosted by quartz veining trending north- south, in contrast to the general NE-SW trend of major faults and lineaments.
Sampling around and to the south of the Brumby workings located more workings not marked on the geological sheets and apparently not under claim; also located was a quartz reef displaying similar characteristics to those at the Brumby. Samples from this reef (1-1.5 m x 300 m) were anomalous, ranging from 0.11 g/t to 4.96 g/t Au, and averaging 0.95 g/t Au.
The Surprise Mine is a prospect appears not to have been worked for many years. The workings are of limited strike extent but alteration exists over a reasonable width, in the order of 50 m. The alteration zone was found to carry 0.16 g/t Au, the quartz 1.07 g/t Au.