The Cuba South prospect is hosted by Permian limestones and represents fault-controlled galena-sphalerite-silver rich veins with abundant barite and Fe carbonate, and lesser silica which is sporadically vuggy. Mineralization occurs as galena, sphalerite, tetrahedrite with secondary smithsonite and malachite in sheared barite-calcite-limestone crackle breccia. Pyrite and chalcopyrite with malachite were also noted.
The North and South Cuba zones (600 metres apart) are unusual in that they lie immediately west of, and appear to be controlled by, the Newmont Fault which forms the eastern boundary of the Newmont Lake graben. The North and South Cuba occurrences may have originally been part of a single mineralized body that has been offset along the northeast trending fault by right lateral movement.
At the South Cuba prospect crackle brecciated and sheared limestone outcrops over an area measuring approximately 350 x 75 metres. Here, numerous barite-calcite-galena-sphalerite-tetrahedrite mineralized showings vary in size from narrow 1 to 2 centimetres wide fracture filling replacements to shear replacements up to 4 metres wide such as is seen to trend through the Phil and Elmer trenches. Smithsonite and malachite are found as secondary weathering products. At the South Cuba Zone, besides the two trenches, two diamond drill holes totalling 133 metres were completed. These holes intersected volcanics under the surface-exposed limestones, as well as some jasper and pyrite. A 7.5-meter section of zinc-rich mineralization intersected at between 38.1 and 45.6 meters down hole 88PG-19 assayed between 0.38 and 0.65 per cent zinc and 48 and 78 grams per tonne silver. Mineralization comparable in grade to that encountered on surface was not encountered. A 1.5 metre chip sample from the Elmer trench assayed 999.09 grams per tonne silver, 0.27 per cent copper, 1.03 per cent lead and 8.83 per cent zinc (Assessment Report 18506)
In 2019, work completed by Crystal Mining Corp. resulted in soil and rock geochemical analyses that led to newly discovered occurrences and to a multi-element geochemical anomaly spread over an 8 kilometre by 4 kilometre footprint (the Chachi Corridor) spatially associated with the McLymont Fault structure. An Induced Polarization (“IP”) ground geophysics survey completed in 2019 has detected a chargeable conductive anomaly within the soil chemical anomalies and occurrences in the footwall of the Mclymont Fault. Over 2000 soil samples, 2000 hyperspectral measurements, and 800 rock samples were collected from this area. Anomalous area include high-grade gold-silver-copper sulphide at the new Leo discovery, high-grade silver, zinc, copper, lead with barite in the Cuba-Thumper trend (104B 334,440, 445) and high-grade nickel, cobalt, copper, silver arsenide/sulphide associated with stockwork copper sulphide mineralization in the new Brass Rose and Grey Rose occurrences.
Exploration of the Cuba showings identified high-grade silver, zinc, copper, lead sulphide mineralization associated with barite along the 3.2 kilometres long Cuba-Thumper trend (MINFILE 104B 334, 440 and 445) to the east of the Mclymont Fault corridor. Grades up to 2,350 grams per tonne silver, 15.2 per cent zinc and up to 5.4 per cent copper were followed up by chip-channel sampling which reproduced high concentrations of silver, zinc, copper and lead over 1.5 to 4.8 metres wide intervals (See assays listed below). Crystal Lake Mining Corp., News Release, Oct.10, 2019).
In 1987, the Cuba showings were discovered on the Gab 8 claim. Structural and orthophoto interpretation work was performed on the Gab 5 to 10 claim area in 1987 on behalf of Northwest Gold Syndicate (Assessment Report 17210). A 105.67 kilometres airborne magnetic and electromagnetic survey was completed. Minor prospecting occurred on the Gab 7 and 9 and Ken zone.
During the 1988 field season, geological mapping, prospecting and trenching was carried out over the Gab 7, 8 and 10 claim area for Pezgold Resource Corporation. Zones where work was done included the Ken, Glacier and North and South Cuba zones. A total of 398 rock chip samples were collected from the claims. A modest drill program totalling 760 metres was designed to initially test the strength and continuity of these various zones. Six short holes totalling 456 metres tested the Ken Zone.
In 2013 Geotech Ltd. carried out a helicopter-borne electromagnetic (ZTEM) and aeromagnetic geophysical survey for Romios Gold Resources Inc over the Newmont Lake Block, comprising parts of the Newmont Lake property (Geophysics Report, Assessment Report 35016, Appendix VI). The following 21 mineral occurrences were covered by the survey: Ken (104B 027), 72 (Dirk) (104B (114), McLymont (104B 126), Northwest (McLymont), (104B 281), Jazzman (104B 282), Ridge (104B 325), Gab Northwest (104B 333), GAB 12 (104B 335), GAB 11 (104B 336), NEW (104B 379), Telena (104B 428), Bren (104B 429), Arseno (104B 432), Mon 2 (104B 433), Glacier Zone (104B 438), Camp Ridge (104B 441), Kirby NE (104B 442), Black Bear (104B 459), 2Bad (104B 460), Bridget (104B 462), O'Neil (104B 463).
In 2014, Romios Gold Resources Inc. conducted a prospecting and sampling program that included the evaluation of various showings and mineralized occurrences on the Newmont Lake and Trek Properties. A total of 314 rock chip samples and reconnaissance rock samples and 26 stream silt samples were collected.
In 2015, Romios Gold reported that a program of additional prospecting and sampling was carried out on the Burgundy Ridge discovery (Exploration and Mining in British Columbia 2015, page 135).
No work is reported for 2016 or 2017.
In January and February 2018, Geotech Ltd. carried out a helicopter-borne Versatile Domain Electromagnetic (VTEM) and aeromagnetic geophysical survey on behalf of Romios Gold Resources Inc. The survey covered three claim blocks: DIRK, KEN and NORTHWEST comprising parts of the Newmont Lake property and covered a total of 714 line-kilometres (Assessment Report 37492, containing Geotech Ltd Geophysical Report (Appendix Two)). The Cuba South is located within the Northwest Block which also covers the following mineral occurrences: Northwest (McLymont), (104B 281), Jazzman (104B 282), Gab Northwest (104B 333), Cuba South (334), GAB 12 (104B 335), GAB 11 (104B 336), Arseno (104B 432), Syenite (104B 439), Cuba North (104B 440), Camp Ridge (104B 441), Kirby NE (104B 442), Kirby SE (104B 443), Thumper (104B 445), Black Bear (104B 459), Ray (104B 696), Arseno Ridge (104B 709), Vera (104B 710), Gerry (104B 713). The aeromagenitic survey indicates that the Cuba South is situated just west of the western edge of a magnetic high; significant VTEM anomalies are located about 3 kilometres to the north and 3 kilometres to the southwest.
In December 2018, Crystal Lake Mining announced that it had acquired a 100 per cent interest in the 436 square kilometre Newmont Lake Project from Romios Gold.
In 2019, Crystal Lake Mining Corp conducted a drill program, on the Burgundy Ridge prospect area (104B 325) and the Northwest deposit. They also conducted extensive grassroots exploration. Crystal Lake sampled and mapped the Cuba-Thumper trend along its 2.5 to 3.2 kilometre length. This trend is found between the Cuba prospects (104B 334 and 440) in the north and Thumper (104B 445) to the south. The trend is characterized by a high-grade high-grade silver-zinc-copper-lead barite system.
See Northwest (104B 281) for further geological details and work history. Also see Burgundy Ridge for further details of the Newmont Lake property (104B 325).