have a look at this place on google maps http://maps.google.com.au/maps?f=q&hl=en&geocode=&q=cadia+valley&sll=-25.335448,135.745076&sspn=57.82946,47.197266&ie=UTF8&ll=-33.456866,148.993363&spn=0.026996,0.039353&z=15 then check the satellite view no need to check OSM - our data isn't up yet but it will be more accurate than theirs