Editing Jamaica — Colonial Geological Surveys 1947–1956

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|| Sheet F — St. Ann
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|| F — St. Ann
 
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|| Sheet G — Upper Clarendon
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|| G — Upper Clarendon
 
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|| Sheet H — South Clarendon
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|| H — South Clarendon
 
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|| Sheet D — Northern St. Elizabeth and part of Manchester
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|| D — Northern St. Elizabeth and part of Manchester
 
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|| Sheet L — Kingston, St. Andrew, and parts of St. Thomas and St. Catherine
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|| L — Kingston, St. Andrew, and parts of St. Thomas and St. Catherine
 
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|| Sheet E — Southern St. Elizabeth
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|| E — Southern St. Elizabeth
 
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The use of a diamond drill, made available through a British Caribbean Drilling Scheme, has so far resulted in 15 holes being drilled to a footage totalling 3,250; by the end of 1956, it is expected that 5,500 ft. will have been drilled. Much useful information in respect of stratigraphy and mineral resources has been obtained. The more important boreholes include three in the gypsum deposits on Bellrock properties, which enabled the Department to calculate the mode, extent and volume of the workable deposits there, and six at Coffee Piece, Swift River, Portland, which led to the estimation of approximately one million tons of iron ore.
 
The use of a diamond drill, made available through a British Caribbean Drilling Scheme, has so far resulted in 15 holes being drilled to a footage totalling 3,250; by the end of 1956, it is expected that 5,500 ft. will have been drilled. Much useful information in respect of stratigraphy and mineral resources has been obtained. The more important boreholes include three in the gypsum deposits on Bellrock properties, which enabled the Department to calculate the mode, extent and volume of the workable deposits there, and six at Coffee Piece, Swift River, Portland, which led to the estimation of approximately one million tons of iron ore.
  
Geophysical surveys, with the aid of an Earth Megger belonging to the Industrial Development Corporation and one on loan for a limited period by kind permission of the Government of the Leeward Islands, were carried out with some success in estimating the extent of iron deposits at " Glade Orchard ", Mavis Bank, St. Andrew, and in the locating of strata favourable for water-supply exploitation.
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, Geophysical surveys, with the aid of an Earth Megger belonging to the Industrial Development Corporation and one on loan for a limited period by kind permission of the Government of the Leeward Islands, were carried out with some success in estimating the extent of iron deposits at " Glade Orchard ", Mavis Bank, St. Andrew, and in the locating of strata favourable for water-supply exploitation.
  
 
A fairly well equipped library of over 2,000 volumes has been built up by purchase and exchange, and to date 26 publications on stratigraphy, palaeontology, mineral resources and water supply have been issued. There are at present 9 more in the press. Numerous reports in manuscript on all these subjects have also been prepared.
 
A fairly well equipped library of over 2,000 volumes has been built up by purchase and exchange, and to date 26 publications on stratigraphy, palaeontology, mineral resources and water supply have been issued. There are at present 9 more in the press. Numerous reports in manuscript on all these subjects have also been prepared.

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