Cornish Metals Inc. (TSX-V: CUSN) is pleased to report the second set of assays from the diamond drilling programme conducted by Cornish Lithium at the United Downs project earlier in 2020.
* reported April 15, 2020 – see company news release dated April 15, 2020
** Additional drilling is required to determine the true width of all reported mineralised zones.
Richard Williams, CEO, stated “These results add further confidence to the exploration potential at United Downs between and beneath the former copper producing United Mines and Great Consolidated Mines. This drilling has identified at least five new zones of copper and / or tin mineralisation that have not previously been recognised.”
GWDD-001 was drilled to a total downhole depth of 1,097.4 m. Based on knowledge of the historic workings and the dominant orientation of the mineralised structures mined in the area, this drill hole was collared in the footwall of the Lithium Lode (high-grade copper / tin) (see drill section here). The hole intersected 6.91 m grading 0.81% copper which is believed to be the down dip extension of “Hot Lode”, one of the principal structures exploited by the historic United Mines.
GWDD-002 was also drilled towards the south and was collared approximately 200 m west of GWDD-001 (see plan map here). In total, it intersected six different mineralised zones, including two new high-grade copper / tin zones:
GEOLOGY AND MINERALISATION
The United and Great Consolidated mines operated between approximately 1757 and 1872 and were principally high-grade underground copper mines (grades reported to be in the order of 7% copper).
In the early 1980s, Carnon Consolidated, then a subsidiary of Rio Tinto, developed the Wheal Maid exploration decline as part of their planned exploration program for the area encompassing the former United and Great Consolidated Mines. Despite initial encouraging results, including the discovery and initial development of the Tregarlands and Whiteworks lodes, the tin price crash of 1985 resulted in the cessation of all exploration activities.
On a regional scale, the geology comprises metasedimentary rocks (locally called “killas”) overlying granite. Copper mineralisation is typically found in the killas, whereas tin mineralisation occurs in both killas and granite. As a comparison, mining in the nearby South Crofty district exploited tin mineralisation over an 800 m vertical extent in the underlying granites.
The exploration hypothesis for United Downs is that significant high-grade tin potential exists beneath the proven area of copper mineralisation, as demonstrated by South Crofty and several other economically mineralised areas of Cornwall.
ABOUT CORNISH METALS
Cornish Metals (formerly Strongbow Exploration Inc) completed the acquisition of the South Crofty tin and United Downs copper / tin projects, plus additional mineral rights located in Cornwall, UK, in July 2016 (see Company news release dated July 12, 2016). The additional mineral rights cover an area of approximately 15,000 hectares and are distributed throughout Cornwall. Some of these mineral rights cover old mines that were historically worked for copper, tin, zinc, and tungsten.
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