Historical interpretation points to larger mineralised zone
Prismo Metals (CSE: PRIZ, OTCQB: PMOMF) has recently acquired the historical data on the Hot Breccia project from the previous owners. On this basis, the mineralisation model for the project located in southern Arizona has been updated in recent weeks.
The historical data includes work completed at Hot Breccia between 1972 and mid-1974 under the direction of Bear Creek Mining Company. It includes a complete log and samples for drill hole OC-1 and a geological interpretation following the completion of drill holes OC-1 to OC-3. An important part of the acquired data shows the distribution of post-mineral quartz-diorite dikes and the location of shallow and deep IP anomalies derived from several different sources.
The Hot Breccia project is located in the world-class Arizona Copper Belt between several very well-studied world-class copper mines, including Morenci, Ray and Resolution, and consists of 1,420 hectares in 227 contiguous mining claims. Hot Breccia shares many similarities with these neighbouring systems. Of particular interest are a swarm of porphyry veins and a series of breccia pipes containing numerous fragments of well-mineralised copper-bearing rocks. Prismo Metals conducted a ZTEM survey last year which identified a very large conductive anomaly directly beneath the breccia outcrops.
Samples taken on the project have since shown the presence of copper mineralisation associated with polymictic breccia, this mineralisation is believed to have brought fragments of sedimentary rock and ore to surface from a depth of probably 400 to 1,000 metres. Deep drilling therefore appears promising.
Historical interpretation points to larger mineralised zone
Bear Creek’s interpretation of the historical IP data indicates that mineralisation is present over a larger area than previously recognised. Notably, the deep IP anomaly and the distribution of copper-bearing xenoliths in quartz diorite dikes coincide exactly with the area of the conductive anomaly identified in Prismo Metals’ 2023 ZTEM geophysical survey.
As Prismo Metals previously only had part of the OC-1 drill log to a depth of 295 metres, the acquisition of the historical data has significantly deepened Prismo Metals’ understanding of the geology of the project. According to the new data, hole OC-1 intersected 403 metres of Cretaceous volcanic and volcano-sedimentary rocks, as expected from the geology in the area, followed by a 330 metre section of quartz diorite porphyry. It contains a pyrite and copper-bearing material that is not exposed at the surface.
Bear Creek hypothesised that this quartz porphyry contains an intrusive phase associated with the mineralisation and is intersected by later adits. The mineralised porphyry includes a 23.5 metre long counterpart of skarn mineralisation averaging 0.54 per cent copper, including 1.8 metres of 1.81 per cent copper. The hole was strongly copper anomalous to the bottom and ended in mineralisation.
A systematic approach key to understanding the deposit
Prismo Metals is taking a very thorough and scientific approach to the development of the project. The historical data is therefore considered very important and has already helped to deepen the understanding of the geology of the deposit. It is therefore expected that the new findings will soon have a strong impact on the 2024 exploration programme.
Prismo Metals has set aside a budget of 3.0 million Canadian dollars (CAD) to complete this year’s drilling programme. It will be used to drill five holes with a total length of 5,000 metres. Each hole will intersect the entire prospective Palaeozoic carbonate stratigraphy. Prismo expects to drill 1,000 to 1,200 metres per hole. The exploration team will use the geological information provided by each drill hole to determine if further drilling is required.
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