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  • This spreadsheet contains 21 oxygen isotope measurements for hematite and mixed hematite/goethite samples from the supergene profiles of the Spence and Cerro Colorado porphyry copper deposits in the Central Andes. Columns are also included which contain calculated isotopic values for weathering fluids which were present at the time of iron oxide formation. These data are presented and discussed in the G-cubed paper 'A rusty record of weathering and groundwater movement in the hyperarid Central Andes' (Shaw et al., 2021). Weathering fluid isotopic values are calculated using the published fractionation factors of Clayton & Epstein (1961), Yapp (1990) and Bao & Koch (1999). The authors have the most confidence in the fluid values obtained using the fractionation factor of Yapp (1990), for reasons outlined in the publication.

  • NERC Grant NE/M011488/1 Electron microprobe analyses of Fe-oxide and Fe-oxyhydroxide phases as elemental percentages per point analysis. The phases were within limonites from Acoje (Philippines), Caldag (Turkey), Nkamouna (Cameroon), Piaui (Brazil) and Shevchenko (Kazakhstan) laterite deposits. The data were acquired during the NERC SoS Minerals CoG3 project between 2015 and 2018 using a Cameca SX100 electron microprobe at the Natural History Museum, London, UK. Point analyses were performed on samples set within epoxy resin blocks, polished and coated with carbon. All elements were analysed using wavelength dispersive X-ray spectrometers. These data were used to identify the Co and Ni bearing host minerals within each natural resource and to assess the amount and variability of these elements within specific Fe-oxide or Fe-oxyhydroxide phases. This may be useful within the mining sector, resource assessment, processing or prospecting, geo- or material scientists and processing engineers / metallurgists. The data were acquired in the Core Research Laboratories, Natural History Museum by the NHM CoG3 team. NERC grant: CoG3: The geology, geometallurgy and geomicrobiology of cobalt resources leading to new product streams

  • The collection comprises photographic half plate black & white negative and 35mm colour transparency copies of plans of mine workings for haematite, gypsum, limestone, baryte and metalliferous minerals for Cumbria dating from 1872 onwards. The plans were originally deposited in compliance with the Coal and Metalliferous Mines Regulation acts. The original plans are currently held by Cumbria County Record Office on behalf of the Health & Safety Executive (HSE) and total about 1240 plans. No digital index is available but a paper catalogue is provided by the Health & Safety Executive. As the collection relates to plans of mines abandoned after the 1872 Act, the holdings are fairly complete after this date. Note however, that the Metalliferous Mines Act originally applied only to mines employing more than 12 men, (eg. some limestone mines). Coal Authority may hold non-coal mine plans not covered by Mine Abandonment Plan collection.