Zenith Minerals (ASX:ZNC) has received results from recently completed ground-based MT geophysical surveys conducted at its Zacatecas lithium brine project in Mexico. The surveys have indicated a conductive layer beneath the Illescas salt lake; 200 – 400m thick, 2.5km in length sited below strongly anomalous surface sample results, representing a compelling lithium brine drill target. Permitting for drill testing is set to commence this month.
Zenith Minerals Limited (“Zenith” or “the Company”) is pleased to advise that results have been received from the recently completed ground based magnetotelluric (MT) geophysical surveys conducted at the Zacatecas lithium brine project in San Luis Potosi State, Mexico. The Zacatecas project is part of the American lithium joint venture with Bradda Head Limited, where Bradda Head is confirming its initial 55% interest by spending US$5 million on exploration.
MT geophysical surveys have been successfully used by many other lithium brine explorers in Nevada and in South America to detect lithium bearing saline brines, which are expressed as conductive layers within deep sediment sequences in salt lakes (salars). Geophysical consultants Zonge completed two MT survey traverses at the Zacatecas lithium brine project. The results show strong conductive zones considered by the joint venture partners to be robust drill targets beneath both the Illescas salt lake and also at the San Vicente – San Juan salt lake area. The results are interpreted to support the presence of significant thicknesses of basin-fill sediments as noted in Mexican Geological Survey cross sections.
· Illescas target: conductive layer is 200 – 400 metres thick, 2.5km in length, ~300m below previously announced strongly anomalous surface sample results up to 452ppm lithium as previously disclosed in ASX Release 24th May 2017 (Figure 1 & 3).
· San Vicente-San Juan salt lake target: although not optimally sited, the traverse indicates a target 100 – 200 metres thick, 4km in length, ~50 to 100m adjacent to previously announced strongly anomalous surface sample results up to 1046ppm lithium (ASX Release 24th May 2017) taken on the San Juan salt lake (Figure 1 & 3).
The Company announced (ASX release 17th January 2017) that it has staked new 100% owned concessions (totalling 26,440 acres) over a new lithium brine exploration project in central Mexico, a region generally known for its large scale silver mines and excellent infrastructure.
Three areas of salt lakes; Illescas, and the adjoining San Juan – San Vicente salars (a total of 26,440 acres) were applied for to cover lithium brine targets. Lithium brines to 2.1% lithium have been reported from small scale, salt production solar evaporation ponds on an adjacent salt lake located 10km west of the Zacatecas project. Those samples were taken as part of a water and surface sediment sampling program conducted by the Mexican Federal Government – Mineral Resource Council. The results confirmed that lithium enriched source brines are present in the Zacatecas district, as well as demonstrating that concentration of lithium by traditional solar evaporation methods is possible.