The Hancock Tenement (E47/3954) is one of two tenements in the Hamersley Iron Ore Project, The Hancock tenement 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 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.
A brief site visit in November 2019 as part of a due diligence exercise enabled a few samples to be collected from the Kalgan prospect with independent laboratory results confirming the Company’s views on the exploration potential.
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 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.
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.
While the mapping and sampling has not comprehensively evaluated all the BIF occurrences within the tenement, at least two targets were highlighted for additional follow-up work concurrently with the maiden drilling campaign.
The exploration field program also laid the foundations for the ongoing drilling programs at the Hancock tenement, which originally targeted two prospects the Kalgan, Sirius extension. With more recent drilling targeting the Western Ridges (Ridge C, D and E), Southern Ridge and Krill Back.
|Location||Pilbara, Western Australia|
|Deposit Style||Classic Pilbara BIF Iron Ore style|
|Key Attributes||Hosts Sirius Deposit Extension, Ridge C and E and Kalgan Prospects, large areas of tenement underexplored|
|Asset Stage||Maiden resource drilling and infill drilling|
|Results||126m @ 60.28% Fe from hole 14SERC004 (Volta Mining, 2013)|
103m @ 61.8% Fe from surface ending in ore (Sirius Extension, AM21RC001 048).
73m @ 59.5% Fe from 6m ending in high-grade ore (Sirius Extension, AM21RC001 047).
|Next Phase of Work||Maiden resource estimation, geological mapping, surface sampling, drilling across tenement|
Maiden Drilling Program
Alien completed maiden drilling in March 2021, with 53 Reverse Circulation (RC) holes for 3,350m of shallow drilling across priority High Grade Direct Shipping Ore (“DSO”) targets. Three main target areas drilled Sirius Extension, Kalgan and Western Ridges (Ridge C, D and E).
Significant DSO results include:
- 103m @ 61.8% Fe from surface ending in ore (Sirius Extension, AM21RC001 048).
- 73m @ 59.5% Fe from 6m ending in high-grade ore (Sirius Extension, AM21RC001 047).
- 26m @ 54.3% Fe from surface, including 13m @ 61.5% Fe from 2m depth (Ridge C, AM21RC001 006).
- 18m @ 55.1% Fe from surface (Kalgan Prospect, AM21RC001 016).
- 10m @ 55% Fe from 3m (Kalgan Prospect, AM21RC001 012).
- 12m @ 60.5% Fe from 4m (Ridge E, AM21RC001 033).
Maiden drilling confirmed four high grade DSO iron ore prospects across the Hancock tenement.
A DSO zone was identified along Ridge C in the maiden drilling with the most significant hole along the ridge being the aforementioned AM21RC001 006.
2nd Drill Program
Phase 2 drilling completed in June 2021, with 40 Reverse Circulation (“RC”) holes for 2,175m, three main target areas drilled Sirius Extensions, Ridges C and E part of the Western Ridges. A new target was discovered during drilling Krill Back southeast of Sirius Extension.
Excellent handheld portable XRF (“pXRF”) results across all targets.
- Sirius Extension, which adjoins the Sirius iron ore project held by Brockman Mining (124mt @ 60.32% Fe) resource drill plan completed with significant pXRF readings including 23m @ 60.5% Fe and 28m @ 60.5% Fe.
- Ridge C including 9m @ 62.8% Fe, 10m @ 61.4% Fe and 10m @ 60.4% Fe has initially defined strike of over 800m.
- Ridge E including 11m @ 65.5% Fe, 11m @ 64.5% Fe, 10m @ 63.1% Fe and 8m @ 62.4% Fe for over 1,300m strike length.
All samples have arrived at the laboratory in Perth and alien are awaiting the results, which are expected in early Q3 of 2021.