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Taiheiyo Cement's Garo Quarry, located in Kamiiso Town just west of Hakodate City in Hakkaido, is a historic quarry opened in 1892 to supply limestone for cement. There are no houses in the surrounding area. The closest residence is more than four kilometers away, and quarrying is carried out on a comparatively large scale under these blessed conditions. Within this enviironment, quarrying operations, carried out using the world's largest-class wheel loader and other large-scale heavy equipment, rank domestically among the top class in production efficiency. Further, careful consideration is given to protecting the surrounding environment and measures are taken to preserve the scenic view from Hakodate, a sightseeing area, and to prevent the generation of pollution from quarrying operations. As the magnesium oxide (MgO) content varies widely in the limestone deposits distributed throughout the quarry and there are frequent intrusions of clay, quality control is extremely difficult. Given these conditions, a quality control system has been introduced and operations are carried our under very strict quality control. In this paper, we will introduce the situation of open-pit quarrying operations at Garo Quarry.

Surface Mining Technologies, Today and Future. Present and Future Situation of Open-pit Quarrying at Garo Quarry.