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Electrical resistivity tomography (ERT) and seismic refraction geophysical methods, augmented with borehole and laboratory measurements on core samples, are used here to delineate the top, bottom and lateral boundaries of an important gypsum ore deposit in Thailand, an economically developing region. The gypsum-bearing formation is found throughout the study area to have an irregular upper boundary on account of karstic dissolution processes. The deeper transition from gypsum to anhydrite, however, is not constrained by the measurements. The P-wave velocity measured in the field is consistent with the core specimen measurements. The electrical resistivity of the core specimens, however, is substantially higher than the values measured in the field. The specimen measurements may depend on the presence of micro cracks, whereas electrical resistivity in the field may be affected by the enclosing clay-rich materials.<\/jats:p>","DOI":"10.1144\/qjegh2019-180","type":"journal-article","created":{"date-parts":[[2020,8,14]],"date-time":"2020-08-14T14:55:46Z","timestamp":1597416946000},"update-policy":"https:\/\/doi.org\/10.1144\/crossmark-policy","source":"Crossref","is-referenced-by-count":4,"title":["Geophysical mapping of gypsum for exploration of reserves in the Nong Bua area of Thailand"],"prefix":"10.1144","volume":"54","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5418-6603","authenticated-orcid":false,"given":"Rungroj","family":"Arjwech","sequence":"first","affiliation":[{"name":"Department of Geotechnology, Faculty of Technology, Khon Kaen University","place":["Khon Kaen, Thailand"]}]},{"given":"Mark E.","family":"Everett","sequence":"additional","affiliation":[{"name":"Department of Geology and Geophysics, Texas A&M University","place":["College Station, USA"]}]},{"given":"Sakhon","family":"Saengchomphu","sequence":"additional","affiliation":[{"name":"Department of Geotechnology, Faculty of Technology, Khon Kaen University","place":["Khon Kaen, Thailand"]}]},{"given":"Kittipong","family":"Somchat","sequence":"additional","affiliation":[{"name":"Department of Geology and Geophysics, Texas A&M University","place":["College Station, USA"]}]},{"given":"Potpreecha","family":"Pondthai","sequence":"additional","affiliation":[{"name":"Department of Geology and Geophysics, Texas A&M University","place":["College Station, USA"]}]}],"member":"1881","published-online":{"date-parts":[[2020,10,13]]},"reference":[{"key":"e_1_3_4_2_1","doi-asserted-by":"publisher","DOI":"10.2113\/JEEG24.2.333"},{"key":"e_1_3_4_3_1","doi-asserted-by":"publisher","DOI":"10.3997\/1873-0604.2013023"},{"key":"e_1_3_4_4_1","first-page":"413","article-title":"Soil salinity mapping of an urbanizing area in NE Thailand","author":"Arjwech R.","year":"2019","unstructured":"Arjwech, R., Everett, M. and Schulmeister, M.K. 2019. 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