The Brockman Tenement (E47/3953) is one of two tenements in the Hamersley Iron Ore Project, The Brockman tenement is 95 km’s northwest of the Tom Price township and borders licences held by Fortescue Metals Group and Rio Tinto.
BHP, as part of their much larger regional programme, covered this tenement in the 1960’s and identified two ‘deposits’ from a combination of mapping and surface rock chip sampling. Hence prospect BHP19 and 20 are associated with the Brockman tenement. The average iron content of four rock-chip samples from prospect BHP19 was 62.8% Fe and the average for four samples from prospect BHP20 was 62% Fe.
BHP used generalised outcrop dimensions and average grade of rock-chip sampling to calculate the estimated Fe tonnage per vertical feet, returning equivalent of 300,000 tons per vertical meter over a surface area of 0.12 square kilometres on the BHP20 prospect.
Alien carried out a very brief reconnaissance field visit in November 2019 and were greatly encouraged by the few surface samples that were able to be collected in the conditions and time frame in the Kalgan and Sirius extension prospects with grades similar if not greater than historic sampling.
The tenement is dominated by the Brockman Iron Formation with tertiary alluvial cover is prevalent and covers much of the surface. Northern areas of the tenement remain highly underexplored yet already contain significant potential for hosting economic high grade iron ore deposits.
Alien have postulated an initial model of the dip and strike of the BHP20 target with provisional drill hole locations to test this model. Drilling has recently been carried out by Rio Tinto immediately south of the tenement boundary on the detrital material shed from this mineralised zone.
|Location||Pilbara, Western Australia|
|Deposit Style||Classic Pilbara BIF Iron Ore style|
|Key Attributes||Hosts BHP 19 and 20 prospects, large areas of tenement still underexplored|
|Asset Stage||Exploration to initial drilling|
|Results||Average iron content of four rock-chip samples from prospect BHP19 was 62.8% Fe and the average for four samples from prospect BHP20 was 62% Fe.|
|Next Phase of Work||Geological mapping, surface sampling, drilling|
A brief site visit in November 2019 as part of a due diligence exercise enabled a few samples to be collected at both BHP19 and BHP20 prospects with independent laboratory results confirming the Company’s views on the exploration potential of the Hancock tenement.
Alien has compiled all historic data into a core database extracting all relevant information from a series of old reports and maps and combine this with any new regional remote sensing data available.
Alien completed an exploration field program in November 2020, sampling over the known prospects within the tenement fully outlining the surface extent of the mineralised units as well as to add mapping and structural information to look for potential repeat structures and orebodies undiscovered to date.
Regional traverses around known prospects have also been done to test as mentioned above the unchartered areas of the tenements and to better understand any repeat structures associated with structural controls in the region.
Maiden Drilling Program
Alien feel that the BHP19 and BHP20 prospects are drill ready targets hence from the model devised finalisation of maiden drilling has been planned for the tenement once access, permission is available.
Alien are currently working on a heritage survey for the tenement area part of the process to be granted permission for maiden drilling. The company are also feel it is a great opportunity to develop a social license to operate with the indigenous population.
Alien have recently completed 2 phases of drilling at the Hancock tenement the other tenement in the Hamersley Iron Ore Project, with very promising results available on the Hancock tenement page.