Further exploration at Australian Securities Exchange (ASX) listed Hawkstone Mining’s Big Sandy sedimentary lithium project has resulted in a 23 per cent increase in the size of the Exploration Target, within Blocks C and D in the Northern Mineralised Zone.
Geological mapping and surface sampling in the northern portion of the project project – located approximately two-and-a-half hours’ drive northwest of Arizona’s state capital, Phoenix – have better defined the extent and stratigraphy of mineralised sedimentary material.
This announcement follows the conversion of the Block A Exploration Target to a maiden JORC compliant resource. The Indicated and Inferred Resources total 32.5Mt at 1,850ppm for 320,800 tonnes lithium carbonate equivalent (LCE).
In addition to previous exploration on the Big Sandy Lithium Project, recent geological mapping and sampling in Blocks C and D in the Northern Mineralised Zone (NMZ), have resulted in the identification of the potential for between 66Mt and 116.55Mt at 1,000 to >2,000ppm Li, an increase of 23 per cent from the previous estimate. There has been, however, insufficient exploration to estimate a mineral resource and it is uncertain whether future exploration will result in the definition of a mineral resource.
The majority of the increase has resulted from geological mapping in the south of Block D, where additional potential was identified, increasing the target to 39.6Mt from 27Mt for the lower range, and to 69.3Mt from 45Mt for the upper range.
A redefinition of the northern boundary of Block C, where it meets the Indicated and Inferred Resources (Previous Target Block A), has resulted in changes to the interpreted potential thickness of the mineralisation. This reflects information gained from drilling on the Block’s northern boundary, resulting in the Lower Exploration Target for Block C remaining unchanged at 27Mt, whilst increasing the Upper Target from 45Mt to 47.25Mt.
This results in an overall increase of 5 per cent in the total estimate for the Exploration Target at the Big Sandy Project from 258.5Mt to 456.6Mt at 1,000 to >2,000ppm Li to between 271.1Mt to 483.15Mt at 1,000 to >2,000ppm Li.
The additional potential of the Exploration Target in Blocks C and D in the NMZ, has been estimated using a range of thicknesses for the mineralised sedimentary material, calculated from data point elevations, drill hole data and geological mapping. The grade estimates a range of values demonstrated from surface sampling.
Hawkstone Mining Managing Director, Paul Lloyd, said that the increase in the Exploration Target forms part of an aggressive exploration program, that has resulted in the conversion of the conceptual target Block A in the NMZ, to a JORC compliant Resource.
“It has also led to another increase in the Exploration Target demonstrating the project’s overall potential. We have further drilling planned as we continue to develop the Big Sandy lithium project.”