dacite


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  • noun

Words related to dacite

a grey volcanic rock containing plagioclase and quartz and other crystalline minerals

References in periodicals archive ?
At the San Jose "cuerpo" 1 to [greater than]2 g/mt Au is found in stockworks and zones of shearing and in an arcuate pebble dike, all within intrusive dacite.
Five main rock types have been identified: the Braden breccia, andesite, diorite, and dacite primary ores, and more fragile secondary ores, and a vast amount of knowledge gathered on the physical characteristics of the rocks and the forces acting on them.
A group of rock chip samples collected across two old adits excavated within a mineralized dacite dike averaged 706 grams per tonne silver (22.
The Western Cordillera along the Chilean border consists of Tertiary to recent volcanic rocks and sediments intruded by dacite stocks with high potential for epithermal, bulk-mineable precious metal deposits.
Three mineralization styles were sampled: 1) quartz veins from artisan workings, 2) argillically altered dacite with minor quartz veining, and 3) highly silicified unaltered dacite.
Silver-zinc-lead mineralization at Pulacayo-Paca is related to a high level epithermal system hosted in an east-west vein structure which cuts a series of Tertiary dacite to andesite porphyritic intrusive rocks and andesite flows which intrude Tertiary sandstones and conglomerates.
Three mineralization styles were sampled: 1) quartz veins from artisanal workings, 2) argillically altered dacite with minor quartz veining, and 3) highly silicified unaltered dacite.
The focus of this drill campaign is to extend the known mineralisation around the contact of the dacite dome.
Several phases of intrusive have been mapped on the property including dacite, micro-diorite and granodiorite; the majority of mineralization and alteration identified to date is hosted by dacitic intrusive.
The north zone is at the contact between iron formation and dacite and contains pyrrhotite and pyrite in silica rich intervals.
Most samples from the highly altered dacite were anomalous (greater than 50 ppb Au).
The veins are hosted in dacite tuffaceous rocks and underlying granodiorite intrusive rocks.
The dome complexes consist of dacite to andesite porphyritic intrusive rocks and andesite flows.
The zone consists of quartz-carbonate veining and silicification developed along a faulted contact between serpentinized ultramafic intrusive rocks and dacite, striking northwest and dipping approximately 55[degrees] northeast," the company reported.