$DSCR News : Discovery Minerals applauds the results of their Geological team's evaluation of the Ruby Gold mine.
GRASS VALLEY, CA / ACCESSWIRE / June 22, 2021 / Discovery Minerals LTD (OTC PINK
SCR), 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 mine 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 Summary
The 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.
Each of these geological components are to be found within the Ruby area, exposed by deeply incised gorges that trend E to W, cross cutting through to the basement stratigraphy. Remnants of the overlying Tertiary volcanics cap the ridge line ranging up to 200m thick locally, but exposures of the underlying gravels and basement on valley margins indicate that the pre volcanic topography was very uneven within volcanics lying directly on the basement stratigraphy in most areas. Remnants of the pre volcanic fluvial grave deposits exposed on the valley sides have been worked by hydraulic mining methods (bolder terraces) and often have tunnels driven into the hill side to work the concealed drifts close by. The result is a complex interplay between erosion surfaces and fluvial / volcanic deposits on the basement metamorphics.
https://finance.yahoo.com/news/discovery-mine...00294.html
GRASS VALLEY, CA / ACCESSWIRE / June 22, 2021 / Discovery Minerals LTD (OTC PINK
SCR), 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 mine 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 Summary
The 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.
Each of these geological components are to be found within the Ruby area, exposed by deeply incised gorges that trend E to W, cross cutting through to the basement stratigraphy. Remnants of the overlying Tertiary volcanics cap the ridge line ranging up to 200m thick locally, but exposures of the underlying gravels and basement on valley margins indicate that the pre volcanic topography was very uneven within volcanics lying directly on the basement stratigraphy in most areas. Remnants of the pre volcanic fluvial grave deposits exposed on the valley sides have been worked by hydraulic mining methods (bolder terraces) and often have tunnels driven into the hill side to work the concealed drifts close by. The result is a complex interplay between erosion surfaces and fluvial / volcanic deposits on the basement metamorphics.
https://finance.yahoo.com/news/discovery-mine...00294.html
