There's no reason to expect the veins to increase thickness with depth. The gold bearing vein material was injected into existing faults in a large granite body( Elmhirst intrusive). The fault widths are usually fairly constant. Since the time of injection the veins have been altered ( cooked) which can cause a thickening and thinning of the vein( pinch and swell) but there's no obvious change with depth. The intercept widths are shown on the long section. They have tried chasing some of the higher grade shoots down to about 500 m depth but haven't found grades as high as the near surface ones. The ore shoots at Red Lake were folded ( bent) at depth so they found some thick, high grade intercepts when they drilled the fold hinges.