Ann: Mulga Bill results - Updated, page-24

The collar itself is a piece of plastic or poly plumbers pipe a couple of metres or so in length generally and is put down the top part of the drill hole to stop the loose surface material collapsing down the hole, people call drill holes collars because that's what you see sticking out of the ground after the drill rig moves away. Knowing the collar location and the angles the holes are drilled into the ground called dip and azimuth would be a requirement from the mines department plus investors or any one interested can look at them all on a map and form thier own opinion or visit the site and make sure they actually exist.