Discovery Minerals applauds the results of their Geological team’s evaluation of the Ruby Gold mine.
June 22, 2021 – Discovery Minerals LTD (OTC:DSCR), the precious metals exploration and production company, is pleased to announce the completion of their geological review and work program for the Ruby Gold Mine on the widely known “ Mother Lode “ in Northern California. Discovery Minerals plans to re activate the Ruby Gold mine which worked deep lead (channel) placer gold over an extended period between 1878 and 1965. The m ine development concept rests on three factors a) that sub ½ ounce alluvial gold which was considered waste rock over much of the mine’s history remains in place or as backfill b) that several kilometres of unworked paleo river channels remain to be mined as well and c) bedrock gold associated with orogenic type gold mineralised quartz lodes underlying and in close proximity to the buried gravel channels remain in place. The current work objective is to compile a three-dimensional model of the topography and historical data including the base of the overlying volcanics (post deep lead cover rocks), the gold bearing conglomeratic river channels from historical plans, the top of bedrock and within the basement metamorphic and greenstone geology (from underground workings and define the broad location, width, and orientation of known quartz-gold lode structures. The Company CEO, Russell Smith, stated that with the use of modern Geophysics and drilling the Company will transform the gold bearing gravel mining operation into a major gold producing area over time.
Geological SummaryThe Ruby Claims geology can be summarised as comprising three key components.
- Basement geology comprised of steeply dipping to vertical metamorphic schists, phylllite, carbonates and quartzites cut by greenstone which are the products of the serpentinization of diorites and/or amphibolite’s emplaced into deep seated N-S trending fault structures. Quartz lode structures typical of orogenic gold systems tend to develop near the greenstone units, and along the quartz lodes high-grade gold +/- arsenopyrite and pyrite ore shoots occur over intervals measured in terms of 10’s to 100’s of metres strike length. The presence of bright green mariposite – a chrome rich mica, is perceived to be an indicator of quartz lode gold grade potential.
- Pre-volcanic deep lead conglomeratic fluvial deposits deposited on the eroded and apparently peneplaned metamorphic basement geology. The lowest of these meandering fossilised river channels which trend from north to south deviating to the west between greenstone units, where the gravels rest directly on the metamorphic bedrock tend to contain the highest concentration of particulate gold and the largest gold slugs or nuggets. As sedimentation continued other meandering river channels developed interbedded with finer grained fluvial sediments, some of which cut down though the older river channels others were perched on basement ledges as higher levels. Other younger less mineralised or barren river channels occur within the overlying volcanic stratigraphy. In a broad sense the channels mapped out by Alling coupled with their relative levels based on where the channels crop out on surface suggest that the southerly trending and coalescing river courses skirted around a central N-S trending ridge of higher basement – a ridge that appears to broadly coincide with the presumed trend of known quartz lodes in the basement stratigraphy.
- Tertiary volcanics overly the paleo river channels, and fluvial deposits are comprised of ash units, laharic deposits, crystal tuffs and lavas. Older volcanic units tend to be rhyolitic and the result of explosive volcanic activity trending with time to andesitic tuffs and lahars and finally overlain by basaltic andesite to basaltic effusive lavas. The volcanic activity occurred during a period of rapid uplift and as a result deep channels were eroded through the older volcanic stratigraphy and fluvial deposits resulting in a partial destruction of the river channel stratigraphy. Notably: white or chocolate coloured ‘pipe rock’ after rhyolitic ash deposits mark the start of the volcanic events and often mark the top of the deeper / older better gold grading paleo river channels.
RecommendationsCompletion of the data compilation and if possible acquiring maps illustrating the extent of the workings between the Carson and Ruby mines is considered a priority prior to finalising a drill proposal for the project. If this data is not available geophysical exploration including a) deep penetrating radar and b) shallow seismic mapping is advised to gain information on the basement/gravel and gravel/volcanic interfaces, perhaps broadly map out underground openings and possibly define where more competent quartz lode structures coupled with greenstones are localised across the property. Drill planning following on from the geophysical surveys would aim to achieve the following objectives through drilling from both underground and from surface.
- Quartz lode exploration – Diamond drilling (minimum HQ core) would perhaps be the best method for gaining bed rock – Quartz lode geology information from underground coupled with end of hole diamond drilling from surface.
- Placer exploration – Inclined (-60 degree) holes to the east drilled from surface along at least three E-W section lines, starting with RC collar though to the anticipated base of volcanic/barren channels, followed by diamond drilling through the gold bearing gravels and fluvial deposits into the basement with further extensions for holes that are expected to test for quartz lode geology as well.