Around 560 000 workers in Great Britain are potentially exposed to respirable crystalline silica (RCS), which can cause disabling diseases, such as silicosis and lung cancer. These experiments assessed the performance of a new Raman spectroscopy method for measuring RCS, samples pure quartz powder with different median aerodynamic particle diameters stone dusts from variety natural artificial s...

Abstract In the coupled electric interaction of rock fractures and gas invasion, that is, when gases interact with newly created crack surfaces, unpaired electrons within crystal defects are thermally stimulated, released into due to temperature rise at tip via plastic work, attached ambient molecules electrify them in a negative state. Using working hypothesis this mechanism is source seismo-e...

A gravel pit in south central Stearns County, Minnesota exposes sand and gravel of the Merden Lake esker which is thought to have been deposited by a subglacial stream associated with the Wisconsinan-aged Superior Lobe of the Laurentide ice sheet. An analysis of these sediments was conducted from samples collected through a vertical trench on an east-facing exposure of the gravel pit. A total o...

The bedrock used for underground construction has obvious traces of hydrodynamic scouring damage, and the mechanical properties especially are severely damaged under a groundwater environment. On this basis, considering excavated various saturations, uniaxial compression test diorite is carried out. Meanwhile, scanning electron microscopy (SEM), energy spectroscopy (EDS) X-ray diffraction (XRD)...

The Qulong porphyry copper and molybdenum deposit is located at the southwest margin of the Lhasa Terrane and in the eastern region of the Gangdese magmatic belt. It represents China’s largest porphyry copper system, with ∼2200 million tonnes of ore comprising 0.5 % Cu and 0.03 % Mo. The mineralization is associated with Miocene granodiorite, monzogranite and quartz-diorite units, which intrude...

the lalezar granitoids crop out within volcanic successions of the urumieh-dokhtar magmatic assemblage (udma). these granitoids have a range from gabbro-diorites to granites in composition. the mineral compositions of the most felsic rocks are characterized by the abundances of na-plagioclase, quartz, alkali feldspar, biotite and hornblende. in the gabbro-diorite rocks, plagioclase (ca-rich), h...