@misc{cole2019olympic,
  title = {Olympic Sand Mine, Macassar. Aeolian dune sand, up to 20 m thick, is mined for mortar sand.}
  author = {Cole, DI and Ngcofe, L and Halenyane, K},
  url = {http://www.fewlbnexus.uct.ac.za/sites/default/files/image_tool/images/91/Report%20on%20mineral%20resources%20of%20the%20WC.pdf},
  year = {2019}
}