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Mining hard rock instead of coal also greatly increases the risk of machine damage.
Chapter 6 covers 'hard rock' techniques with emphasis on thin sections, but like nearly all others it is too concise to help with applications to ceramics, a non-trivial subject.
In most heavy metal and hard rock, this ambiguity was not played up to a large degree, with the modality usually being firmly established through context.
This tension appeared even before 1881, however, beginning in 1874 when most of the upper layers of earth had been sifted through, and now, lying beneath, was hard rock.
Three principal types of formation are under consideration—hard rock, clay and salt.
Others are found in hard rock and have to be worked by mining methods that are relatively high cost.
There is a future for hard rock mining in my county.
Radiation-induced lung cancers have been reported in uranium and hard rock miners for a long time.
No doubt dredged material would be used for in-fill to lessen demand for hard rock.
This is equivalent to an impact of about 65 mph on to hard rock or 75 mph on to concrete.
Vitrified waste was put into solid metal canisters which were drilled 5,000 ft or 10,000 ft into hard rock and then buried underground.
There comes a time when, however clever, however élitist, there are hard rock situations that have to accommodate these matters.
It should be free from water or hard rock to a depth of not less than 4 feet 3 inches.
Unfortunately, the text voted today at second reading has reintroduced the possibility of storing mercury in sites other than salt mines, specifically in deep underground hard rock formations.
Delays due to inappropriate weather and tidal condition have also been exacerbated by the longer time being taken to prepare the seabed excavations in very hard rock.
