The mining company had discovered there was a relationship between high grade gold and where these dykes intersect. Another example uses gamma spectroscopy to locate felsic dykes that are high in potassium. One interesting example uses in-mine reflection seismic to locate pods of chromite ore. We start with Reid’s paper entitled The Complete Mine Site Geophysicist – Assisting Mining Operations with EM, Radiometric and Seismic Measurements which provides 3 interesting examples from Africa using innovative solutions to locate additional reserves close to existing mines. A – Focus on Brownfields and Green fields We have divided the issue into several focussed themes. In this issue we provide examples of using geophysics to address some of the concerns mentioned above. Geophysical data provide important information at mine sites that can be used to solve a wide range of potential issues: 1) post exploration discovery 2) geotechnical and infrastructure studies 3) minimizing ore contamination, waste dilution and mining hazards 4) waste management – rocks, tailings and mine waters 5) management of ground water, surface water and mine water, andĦ) environmental management, rehabilitation, and mine closure (for more information see the article by Pettifer, 2018). The list of decisions that are required during a mine’s life is long and complex. Prolonging mine life by locating additional resources nearby is also important for profitability. Placement of infrastructure at a mine site requires knowledge of the locations of potential satellite ore bodies in the mine area so that construction can bypass these areas and save expensive modifications later. Environmental issues must be addressed as well such as ensuring the isolation of contaminated water from surface and ground water sources. During the mine-life cycle many decisions are required that impact the economics and safety of the mine (for example, the location of tailings ponds). Mine sites have long lives, starting with their discovery and ending with their closure. Welcome to this special issue of FastTIMES entitled: Mine Site Geophysics.

Prototype model in res2dinv