Bulletin Bulletin 190 – 4-meter Diameter Raise Bore Design Kimberlite Diamond Mine, CanadaFebruary 8, 2010/by jsubt http://www.subterra.us/wp-content/uploads/2017/02/squareLogoWork.jpg 251 300 jsubt http://www2.subt.com/wp-content/uploads/2016/04/aspectRatioWebsite-300x137.jpg jsubt2010-02-08 06:48:402017-02-11 00:17:37Bulletin 190 - 4-meter Diameter Raise Bore Design Kimberlite Diamond Mine, Canada