The Paterson Project comprises the Havieron, Black Hills and Paterson Range East licences, covering over 385 square kilometres of under-explored ground in the Paterson Province in Western Australia prospective for iron-oxide-copper-gold (IOCG) and Telfer style gold deposits.
The Paterson region hosts several large gold and copper deposits such as Telfer (27M oz) and Nifty (2MT copper). The region has been subject to more recent exploration which has outlined several other deposits including Magnum (Au), Calibre (Au), O’Callaghans (Cu) and Maroochydore (Cu).
Regional targeting by the Company has highlighted the potential for a new IOCG district with multiple targets identified across the Company’s licences, with recent drilling demonstrating the potential for one such target, Havieron, to represent a very large mineralised system.
In June/July 2018, Greatland announced results from its first drilling campaign at Havieron, including exceptional results from the first drill hole (HAD001: 121m at 2.93g/t gold and 0.23% copper from 497m, including 11.5m at 21.23g/t gold and 0.67% copper from 568.5m, including bonanza grade intervals 0.5m at 137.69g/t gold and 1.8% copper from 573m and 0.5m at 100.15g/t gold and 4.1% copper from 575.5m). Geophysical data has outlined the Havieron target as covering approximately 1,000m x 1,000m. Depth to top of target is around 400m with these depths easily achieved with modern drilling equipment.
The Black Hills area is regarded as having high potential for hosting gold deposits similar in style to Newcrest’s Telfer Mine. In June/July 2018, Greatland reported that it had collected multiple gold nuggets at surface in its first exploration campaign at Black Hills (see photos in Black Hills section below) and had established the presence of high grade gold mineralisation at surface across a 200 metre strike length at the Saddle Reefs prospect.
Although the region is remote infrastructure is good with several operating mines, sealed roads and formed tracks plus rail networks nearby which branch out from the regional industrial hub of Port Hedland 500km to the west.
The Paterson Project licences are located approximately 40 kilometres east of the prolific Telfer gold mine owned by Newcrest (27Moz). Other discoveries in the region include Magnum (Au) and Calibre (Au), both owned by Antipa Minerals, O’Callaghans (Cu), Maroochydore (Cu) and the recent Paterson North gold discovery by SIPA Minerals.
The Paterson Province is the northern portion of the Proterozoic Paterson Orogen. More recent exploration throughout several Proterozoic Orogens identified within the western parts of the Australian continent have resulted in the discovery of the large Tropicana gold deposit (7.9M oz) and large Nova nickel-copper deposit (10MT). Globally these Proterozoic Orogens are highly prospective for large deposits, and are often under-explored.
Alteration and mineralisation of those targets which have been drill tested at Havieron and Paterson Range East display similarities to IOCG-type deposits. Examples of these are the large Olympic Dam and Ernest Henry deposits in central and eastern Australia.
Prospectivity of the Paterson Province is widely recognised with several large industry participants present. These include Rio Tinto, Newcrest and Antipa. Greatland’s licences lie adjacent to Rio Tinto and Antipa.
Havieron and Paterson Range East
The Havieron target as outlined by geophysics is large, covering approximately 1,000m x 1,000m. During the period 1991-2003, Newcrest completed six diamond drill holes at Havieron. All holes intersected significant alteration and three holes intersected significant Au-Cu skarn style mineralisation. Hole HAC9101 intersected firstname.lastname@example.org/t Au, including email@example.com/t Au and 0.28% Cu with a peak gold value of 14.7g/t Au. Hole HAC9201 intersected firstname.lastname@example.org/t Au, including email@example.com/t Au and 0.22% Cu with a peak gold value of 15.4g/t Au. Mineralisation starts at 400 metres below surface. Mineralisation is open in all directions and at depth.
In Q2 of 2018, Greatland carried out its maiden drill campaign at the Havieron target, completing four vertical core holes for a total of approximately 2,400m of drilling. Greatland’s drill locations were designed to intersect the mineralised system at Havieron near to historical drill holes. A second drill campaign began in Q3 2018 with up to 6,000m of drilling planned.
Drill assay results from Greatland’s first four drill holes at Havieron established the presence of high grade gold (peak 137.69g/t or 4.4 ounces per tonne) within the mineralised zone and highlighted the potential for Havieron to represent a very large mineralised system.
The second drill campaign has, to date, shown two mineralised zones; an upper and lower zone separated by an unmineralised mafic intrusion from 577m to 660m. The results from the first hole of this campaign, HAD005, significantly extend the known high grade mineralisation established in the first drilling campaign (HAD001-4) and establish new peak grades for the mineralised system, including peak gold of 211.30g/t and peak copper of 8.45%
Laboratory assay results from Greatland’s drilling campaigns at Havieron include:
HAD001 – 121m at 2.93g/t gold and 0.23% copper from 497m, including 11.5m at 21.23g/t gold and 0.67% copper from 568.5m, including bonanza grade intervals 0.5m at 137.69g/t gold and 1.8% copper from 573m and 0.5m at 100.15g/t gold and 4.1% copper from 575.5m. Elevated gold and copper results persisted to end of hole suggesting the mineralisation continues at depth.
HAD002 – 1m at 5.9g/t gold and 0.24% copper from 443 and 2m at 5.44g/t gold from 488m.
HAD003 – 21m at 3.78g/t gold and 0.44% copper from 418m including 29.12g/t gold and 0.4% copper from 428.5m.
HAD005 – total combined intercept of 275m at 4.77g/t gold and 0.61% copper returned from 1) An upper zone of 118m at 3.08g/t gold and 0.84% copper from 459m to 577m, including: 11.5m at 6.23g/t gold and 2.49% copper from 462.5m and 7.5m at 32.83g/t gold and 1.20% copper from 482m; 2) A lower zone of 157m at 6.04g/t gold and 0.44% copper from 660m to 817m, including: 113m at 8.30g/t gold and 0.61% copper from 663m; 5.5m at 16.62g/t gold and 0.91% copper from 663m; and 38m at 20.17g/t gold and 0.82% copper from 700m.
Following a review of regional geophysical and geochemical data over the Paterson project approximately fifty IOCG targets were identified in the broader region, with around half in ground held by Greatland. The setting of these licences is on the western margin of a Proterozoic basin which ranges in depth from less than 100m below surface to more than 400m below surface.
New 3D gravity and magnetic models indicate that there is potential for mineralisation at Havieron to extend from approximately 400m below surface to depths in excess of 1,200 metres below surface. Modelling of gravity data outlines a large irregular shaped body, some 300m across, from approximately 400m below surface (top of basement) to 1,200m below surface with an overall subvertical attitude. Modelling of magnetic data defines a single, discrete, high amplitude elliptical shaped body that is steeply dipping (subvertical) toward the south east with a depth extent from around 800m below surface to approximately 1,400m below surface, but the body may continue beyond 1,400m as this is the current limit of data resolution A comparison of 3D gravity and magnetic models shows an approximate 500m vertical and 200m lateral offset between the causative bodies, which may be important for targeting if Havieron displays affinities with an iron-oxide-copper-gold (“IOCG”) system.
Historically, several of these targets have been subject to initial first-pass work and show promise at hosting mineralisation as seen at Havieron. The geophysical signature of these targets is very similar to that at Havieron. Basement rocks of the basin are predominantly calcareous rich sandstones intruded by several late stage granitic bodies exploiting basin margin faults which have also provided a focus for ore fluids. Basement rocks do not outcrop and Greatland intends to employ modern geophysical and geochemical methods to define targets prior to drill testing.
The Black Hills licence lies 30 km east of the large Telfer gold mine (27m oz). Covering 25 square kilometres it sits adjacent to the Company’s Havieron exploration licence. The Black Hills licence is regarded as having high potential to host gold deposits similar to Telfer. There has been a reasonable amount of historical exploration work at Black Hills with several discrete zones of mineralisation identified over 5km of strike. Rock chip samples have returned up to 90g/t gold, and commonly 20g/t gold, with free (visible) gold in places. Drill intercepts include 3m at 9.14g/t gold from 26m downhole (incl. 1m at 21.2g/t from 27m (CBR073)), 1m at 10.0g/t gold from 16m (CBH138), 1m at 4.93g/t from 12m (CBH071) and 1m at 3.12g/t from 37m (NBH004). Historical drill spacing appears quite broad with holes at least 400m apart, some up to 600m.
Gold prospects identified to date extend from Black Hills into the north western parts of the Havieron licence. Proterozoic sandstone and carbonate rocks of the Yeneena Group formations are present, including the Telfer Formation, in a domal structure which is the equivalent geology to that of the large Telfer gold deposit (27m oz) located 30km to the west.
A large amount of historical surface exploration data for the Black Hills area has been compiled and merged into the Company’s database. This is the first time all data has been merged and interrogated with modern technologies. Gold mineralisation has been outlined at several prospects throughout the licence including Saddle Reefs, Eastern, Rogers and Northern Granites (within an area of 6.5km x 2km).
Strong surface gold mineralisation is present at the Saddle Reefs prospect with rock chips including 55.6g/t, 20.0g/t, 19.65g/t, 18.45g/t and 17.0g/t over an area of approximately 1,400m x 800m. The zone has a north-westly trend and sporadic drilling with results including 3m at 9.14g/t gold from 26m downhole, including 1m at 21.2g/t from 27m, in hole CBR073. This zone is in the core of an anticlinal feature and, overall, is gold prospective over a strike length of approximately 3km.
Fieldwork observations reveal the area is prospective with numerous indications of mineralisation in bedrock. Gossanous samples have been collected from outcrop and gold nuggets have been found within thin sand cover at the prospect. Primary gold mineralisation has also been located in bedrock where gold pieces in rock chip samples are present.
At the Eastern prospect a linear zone of gold mineralised stratigraphy is apparent over a strike of approximately 4km. Surface rock chip results include 1.9g/t gold, 1.2g/t gold and 1.0g/t gold. Broad spaced drilling along the zone has returned results including 1m at 10.0g/t gold from 16m (CBH138), 1m a 4.93g/t from 12m (CBH071) and 1m at 3.12g/t from 37m (NBH004). The mineralisation appears to track along a structural contact and the focus will be on identifying the higher grade mineralisation along this trend.
The other prospects of Rogers and Northern Granites show prospective gold mineralisation at surface with rock chip results including 50.2g/t and 10.45g/t at Rogers and 6.9g/t at Northern Granites. Drill testing is limited but results have included 1m at 1.48g/t from 38m (NBH008) at Rogers and 1m at 2.35g/t gold from 5m (CBH253) at Northern Granites.
The Company will carry out field work over several prospects at Black Hill including surface geochemical sampling and geological mapping to determine the areas with the greatest potential for high-grade gold mineralisation. Results of this work will outline drill targets at the Black Hills project.