Iron Ore: Brockman & Hancock Ranges

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Hancock Ranges Iron Ore Project

The Hancock Ranges Iron Ore Project (E47/3954), is within 20kms of the Newman township and borders licences held by Fortescue Metals Group, Hancock Prospecting, BHP Billiton (Mount Whaleback), Hope Downs and Brockman Mining.

The Hancock Ranges tenement was previously explored by Rio Tinto plc, BHP Group plc, and more recently Volta Mining Limited (“Volta”).

Historical work outlined two areas of high-grade iron ore mineralisation: the Sirius Extension Prospect and the Kalgan Prospect. In 2013, Volta undertook reconnaissance mapping and surface rock chip sampling and drilled 4 drill holes for a total of 475m which confirmed an economic strike extension of the Sirius Iron Ore deposit within the tenement. This strike extension is hosted in the Brockman Iron Formation with hole 14SERC004 returning 126m @ 60.28% Fe from surface, with surface sampling further along strike supporting the strike extension.

Votla Mining Drill Cross Section E47/3954 Sirius Extension

Exploration UPDATE

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 and over part of the Kalgan prospect with independent laboratory results confirming the Company’s views on the exploration potential of both of these projects.

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 on both tenements 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.

Broad regional traverses 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.

Alien feel that the BHP20 prospect is potentially a drill ready target hence from the model devised finalisation of some scout drilling is also being planned for preparation to drill when access, permission and funding is available.

The exploration field program has also laid the foundations for the ongoing drilling program at the Hancock Range tenement, which is targeting the Kalgan, Sirius extension prospects.

The laboratory assays have confirmed high-grade iron ore results of up to 66% Fe. These are excellent results and confirm the findings from XRF readings taken in late October. Our technical team has scoped out drilling access at the Hancock Ranges Project and in particular the Kalgan prospect. Additionally, the team has taken additional samples from Kalgan to in-fill areas covered from the October programme.

Seven mapping transects were walked across the Kalgan Prospect to test for the presence and lateral extent of previously reported high grade occurrences of iron ore. In situ outcrop of rock was mapped with 128 mapping points and 25 rock chip samples collected from mainly Banded Iron Formation (BIF) outcrops where iron was the dominant mineral present. BIF dominated by silica bands, dolerite, shale and rhyolite was not sampled in this program. In addition to the walked transects, a helicopter survey of the surrounding terrain was conducted and a further 12 samples were collected.

A series of BIF ridges were mapped parallel to the regional trend and on strike and parallel to the original Kalgan prospect trend and have returned constantly high-grade Iron with the majority from the sampling averaging over 60% Fe. Figure 3 below shows the sample locations and Iron Ore grades and shows the continuity of ridges C and D especially with the current sampling continuity both with consistently greater than 60% Fe grades. Ridge B also appears to host high-grade iron ore mineralisation and was recently sampled to fill in the gap between ridges B and F.

The Kalgan prospect laboratory results show strong continuation and correlation along a nearly 3km strike-length along several exposed ridges with excellent grades of DSO level iron.

While the mapping and sampling has not comprehensively evaluated all the BIF occurrences within the tenement, at least two targets have been highlighted for additional follow-up work concurrently with the maiden drilling campaign.


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.

Both tenements remain highly underexplored yet already contain significant potential for both 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.

ProjectBrockman & Hancock Ranges
CommodityIron Ore
LocationPilbara, Western Australia
Deposit StyleClassic Pilbara BIF Iron Ore style
Key AttributesHosts Sirius Deposit Extension, BHP 19 and 20 prospects , the Kalgan Prospect yet still underexplored
Asset StageExploration to initial drilling
Results126m @ 60.28% Fe from hole 14SERC004 (Volta Mining, 2013)
Next Phase of WorkGeological mapping, surface sampling, drilling
Deal PartnerAvailable
Deal TermsTBC

Maiden Drilling Program

We are extremely pleased to get underway with this maiden drilling program which the team has managed to deliver in a very short timeframe. The recent sampling and mapping work completed at each phase has added confidence to the potential of both tenements.

Alien also has the necessary permissions in place for the Hancock Project and the funding to start proving up the true potential of the historically known prospects (Kalgan and Sirius Extension), as well as some newly identified significant targets which we are about to start drilling.

Three Rivers Drilling of Western Australia are a tried and tested drilling company with an excellent track mounted Reverse Circulation (RC) rig ideal for this initial program. Our skilled technical team are keen to develop these exciting targets and to continue to develop this project up the knowledge and value curve.

Drill Program

This maiden drilling program on the Hancock Ranges project is to test four main targets now defined from historic and recent work, namely two high grade east west ridges of outcropping high grade iron ore in the central and north central parts of the tenement recently identified by Alien in field mapping and sampling and the historically defined Kalgan and Sirius Extension prospects.

Three Rivers Drilling Ltd of WA will provide a Schramm track mounted T450 Reverse Circulation (RC) drill machine, rated to 350m depth, with 6.0m pullback and an on-board 900cfm/350psi Compressor. They will support the drill rig with an 8×8 Support Truck with water and diesel storage, a 4 x 4 Mine Specification Support vehicle, RC equipment to carry out drilling to a depth of 80 metres, a drilling team for the rig comprising 1 Senior Driller, drilling offsiders along with 1 Drill Fitter assigned to the project as required for seven days per week operations.

The drill rig has an industry standard cyclone and sample splitter which means each sample can be correctly and within international standards and procedures. It also complied with the rigorous HSE standards of Australia to maintain the necessary international standards followed by Alien. At this stage Alien plan to sample every meter drilled and once tested on-site with a handheld XRF unit to get an initial indication of iron content along with visual inspection and logging of each sample to then dictate how many samples are submitted to the laboratory for analysis. (CRM) samples, 5% Certified Blank Samples (Blanks) and 5% duplicate samples at source. The CRMs will be sourced from Geostats Pty Ltd, Perth, WA, a global leader in the manufacture and sale of CRMs and Blanks.

The planned holes are spread across four initial areas to enable the company to continue to develop our knowledge of the project as a whole and to further prioritise for next stage drilling.

All samples generated will be despatched to Intertek Genalysis at Maddington, WA, and analysed for their Basic Iron Ore Package Analysis with XRF finish, which includes elements Fe, Al, Ca, K, Mg, Mn, Na, P, S and Si. This is the same as the analysis and laboratory used in all Alien’s analysis work on these projects to maintain consistency and comparability between all analyses.

Maiden drilling on the Brockman tenement is still in development stage with a follow up field mapping and sampling program planned prior to finalising a drilling program, along with getting thenecessary permission to drill within the tenement all which is ongoing.

brockman & hancock ranges grade samples 2019

Sample NbrTenementProspectFe (%)P (%)
P592801Hancock RangesSirius Extension62.540.21
P592802Hancock RangesSirius Extension58.410.08
P592803Hancock RangesSirius Extension64.160.13
P592804Hancock RangesKalgan63.90.13
P592805Hancock RangesKalgan49.930.05
P592806Hancock RangesKalgan62.70.16
P592808Brockman Iron‘BHP20’60.270.09
P592809 Brockman Iron‘BHP20’57.980.09
P592810Brockman Iron‘BHP20’57.760.10
P592811Brockman Iron‘BHP20’49.860.09
P592812Brockman Iron‘BHP20’550.15
P592818Brockman Iron‘BHP19’57.50.13
P592819Brockman Iron‘BHP19’58.460.09
P592820Brockman Iron‘BHP19’59.240.08
P592821Brockman Iron‘BHP19’65.430.13
P592822Brockman Iron‘BHP19’64.290.09
P592823Brockman Iron‘BHP19’59.10.07

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