Examination of three opencast-mined seams for comparison with deep-mined seams. Opencast sites: a. Waunlwyd, b. Bryngwyn, c. Talywaun. Seams: a. Big Vein, b. Nine Feet, c. ‘Lower Big’ (Threequarter) Jun 1959

  • This material is held at
  • Reference
      GB 216 D/D PRO/NCB/6/33
  • Dates of Creation
      Jun 1959
  • Language of Material
  • Physical Description
      1 file