RE:RE:RE: Drill for structure drive for grade Loves , not a bad explanation, but with one important necessary clarification The raisin bread is a good analogy but the ore body is more like a loaf rather than a slice. This sounds pedantic and hair splitting , but the stopes are planned and blasted in three dimensions. Even if the high grade raisins can be identified and drifted thru on one level , the stopes are about 30 metres high. How does one identify the location of the higher grade material 10 , 15 or 20 metres above the sill level??? I dont have a clue myself which is why I always believed that transverse stoping was the correct choice. Yes you get a lot of low grade but you are pretty much guaranteed 98% of the high grade raisins.
Perhaps the geologists will be able to identify structural controls in which lcase ongititinal stoping will work OK but probably with only 85% of the raisins being blasted