Deposits of dimension stone in Benin and their classification after UNFCR

Stein, Karl-Jochen

doi:10.1127/1860-1804/2007/0158-0429

Cited by 2 publications

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“…Dimensional stone deposits are not representative of typical mineral deposits as for example massive mineral deposits (construction aggregates, e.g., sand, gravel). The industrial requirements in décor and block volume (or size, or dimensions) determine the selection of a section inside a deposit, in which these requirements are achieved and are at the same time demanded by the market (Stein 2007). Basically, some aspects of the evaluation of aggregate deposits can be applied in the case of dimensional stones (Kelter et al 1999).…”

Section: Deposit Characterizationmentioning

confidence: 99%

Granitic dimensional stones in Uruguay: evaluation and assessment of potential resources

Demarco

Oyhantçabal

Stein³

et al. 2012

Environ Earth Sci

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In Uruguay commercial granite varieties comprise mafic rocks, granitoids, and syenitoids. There is a long tradition in Uruguay, as well as worldwide, of using dimensional stones in architecture and art, specially granitic ones. Some of the present applications of these dimensional stones are as façade cladding, countertops, and outdoor and indoor floor slabs. The color spectrum of the Uruguayan granitic dimensional stones varies from black to light gray, covering a wide variety of red and pink and minor greenish-gray. The décor of these granitic dimensional stones is mainly determined by their fabric, fundamentally the grain size and the color distribution between the different minerals that compose the rocks. In the present research the most important commercial granites were sampled to analyze their petrography and petrophysical properties. A detailed structural analysis has been performed in several deposits, as well as the application of the software 3D Block Expert for modeling the possible raw block size distribution. Other factors controlling the mining viability of the deposits were also studied (e.g., homogeneity/heterogeneity of color and décor) and the possible reserves were calculated.

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Section: Deposit Characterizationmentioning

confidence: 99%

Granitic dimensional stones in Uruguay: evaluation and assessment of potential resources

Demarco

Oyhantçabal

Stein³

et al. 2012

Environ Earth Sci

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Mineralogy and Geochemistry of the Kinnikinic Quartzite at the Arco Hills Silica and Gold Project in Butte County, Idaho: Results of an Ore Quality Spot Check and Implications for Potential Plasma Furnace Processing

et al. 2020

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Plasma furnace processing has the potential to transform solar cell production. If informed decisions regarding silicon ore and mineral exploration can be made such that waste streams are also of high economic value, then production is ultimately more environmentally integrated. This study presents results from a spot check of the Kinnikinic Quartzite, ~4.5 km east of Arco, Butte County, Idaho (43.639091°, −113.243295°), for ore quality. The mineralogical and geochemical characteristics are explored within the context of a planned plasma furnace project at the sampled site and are compared to previous consulting reports. X-ray diffraction analysis detected only quartz, while scanning electron microscopy identified quartz grains, secondary quartz cement, trace amounts of potassium feldspar, minor iron oxides, and secondary illite. The bulk chemical characterization of 20 samples (including repeats) reports several wt. % variation in SiO2 from 96.47 to 99.66. Other notable chemical components include Al2O3, K2O, CaO, and Rb, all consistent with the presence of potassium feldspar (and illite). Gold concentrations vary from below detection (n = 12 out of 20) to a maximum concentration of 0.086 ppm. Total sum REE concentrations vary from 13 to 143 ppm. Conservatively and optimistically, assuming ideal extraction and recovery in plasma furnace operation, a resulting waste stream would have approximately 15.2 ppm (0.488 oz./metric ton) gold and 3400 ppm REE in the average waste. Gold (and REE extraction) may, however, be complicated by the presence of Fe and Cu if cyanide approaches were implemented. Gold concentrations are significantly lower than reported in previous work, warranting further characterization of this unit locally and regionally in order to characterize ore potential. This study works to demonstrate the possibility of evaluating other potential silicon ore units, such as the St. Peter Sandstone in Illinois and Missouri, for the co-production of materials in support of an emerging green economy.

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Deposits of dimension stone in Benin and their classification after UNFCR

Cited by 2 publications

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Granitic dimensional stones in Uruguay: evaluation and assessment of potential resources

Granitic dimensional stones in Uruguay: evaluation and assessment of potential resources

Mineralogy and Geochemistry of the Kinnikinic Quartzite at the Arco Hills Silica and Gold Project in Butte County, Idaho: Results of an Ore Quality Spot Check and Implications for Potential Plasma Furnace Processing

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