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On the Minerals of the Rio Tinto Mines

Published online by Cambridge University Press:  14 March 2018

J. H. Collins
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Extract

The great pyrites masses of the Sierra Morena, of which those worked at Rio Tinto are by far the most extensive, may be briefly described as contact deposits, which differ from such as are ordinarily met with only in size; and from ordinary fissure veins only in the circumstance that the cavities in which the minerals occur are bounded by dissimilar rocks.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 5 , Issue 25 , August 1883 , pp. 211 - 216
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1883

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References

page 211 note * They are frequently spoken of as lenticular, but their form is far from resembling that of a lens, even in horizontal cross-section.

page 212 note * For a description of some of these horizontal deposits of iron ore, see a paper by J. A. Phillips, F.B.S., Quart. Journ. Geol. Soc.

page 213 note * This is an analysis of a fair sample of ore exported in 1878, made by a friend. The ore exported at present is slightly richer, but the composition of the mineral does not materially differ.