Caprock Confirms Zinnwaldite as the Lithium-Bearing Mineral at Ackley

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Toronto, Ontario--(Newsfile Corp. - November 29, 2023) - Caprock Mining Corp. (CSE: CAPR) ("Caprock" or the "Company") is pleased to announce that following a comprehensive analysis by SGS Natural Resources ("SGS") based in Lakefield, Ontario, the lithium-bearing mineral in samples collected from the Company's Ackley property ("Ackley", or the "Property") located in south-eastern Newfoundland, has been confirmed as zinnwaldite.

Caprock's CEO Mr. Vishal Gupta states: "We are very pleased with today's highly anticipated confirmation. We see zinnwaldite as an extraordinary mineral that is a superior host to lithium than the highly sought-after mineral, spodumene. The production of lithium hydroxide from zinnwaldite requires considerably less energy and capital than from spodumene, as has been demonstrated by the successful zinnwaldite mining and processing operation at the Cinovec project in the Czech Republic, and the PEA-stage Zinnwald project in Germany."

Mr. Gupta adds, "Assays of several surface samples recently taken from Ackley have returned Li2O values greater than 1.00%, which compares quite favourably to the overall resource grade of 0.39% - 0.45% Li2O at Cinovec, and the average resource grade of 0.76% Li2O at the Zinnwald project. Given the strong association of zinnwaldite mineralization with the intrusive granite proximal to the 'greisened' contact with the meta-volcanic/meta-sedimentary country rock, we have identified a large area spanning several square kilometres that has the potential to host substantial zinnwaldite mineralization at Ackley."

More About Zinnwaldite

Zinnwaldite is a potassium-lithium-iron-aluminum-silicate-hydroxide-fluoride phyllosilicate mineral within the mica group that typically occurs in greisens, pegmatites and quartz veins, and is often associated with tin ore deposits.

In general, zinnwaldite is considered to be the least energy and capital-intensive hard rock mining alternative to a lithium-brine operation with respect to the production of lithium hydroxide, especially when compared to spodumene. Whereas spodumene concentrate must undergo two separate "high temperature" roast cycles prior to the production of lithium hydroxide, zinnwaldite concentrate only undergoes a single "medium temperature" roast cycle in order to produce lithium hydroxide.

Additionally, unlike spodumene which has a tendency to lose its lithium content when exposed to ambient weather conditions, zinnwaldite is not subject to weathering to that extent, which allows for greater certainty of supply and control of production.