History of the Guano Mining Industry, Isla de Mona, Puerto Rico by
Edward F Franks. Journal of Cave and Karst Studies [former Bulletin of
the National Speleological Society of America] Vol 60 No 2 August 1998
pp 121 - 125, 10 illus including photos. In the late 1800s and early
1900s, ~150,000 metric tons of phosphorite, altered bat guano, were
mined from the caves. A high phosphate content made the phosphorite a
valuable fertilizer. The guano deposits have been exhausted from seven
of the eight largest known cave systems on the island. Many relics from
the guano mining days are still present in the caves and surrounding
areas today.
Price, Martin Connop [1996] Coal, Culm and Cresswell Quay: some aspects
of the Pembrokeshire Coal Industry in the Eighteenth Century [in]
Journal of the Pembrokeshire Historical Society No˙6 1994-1995 pp 25 -
34 maps photos.
ibid p 35 Myddletons of Chirk Castle; p 37 et seq William Powell of
Nanteos; p 67 John Owen, son of Thomas Owen of Rhydygath, Llanfyrnach,
and a nephew of John Owen, Glogue quarry ...; p 68 ref 4 Her husband
was David Davis, a tailor, born in Llanglydwen. By 1851 they had 7
children...
Elis Gruffydd, Dyfed 1993 Gwaith Mwyn Llanfryrnach: un o Ddiwydiannau
coll Dyffryn Taf / Dyfed. Y Naturiaethwr (30) pp 1 - 6 [Llanfrynach
Lead Mine, Pembrokeshire].
Contributed by TO
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