great chance we hit diamonds A large airborne geophysical survey was flown in late 1987 and was then followed up with the ground surveys. This information was used to select targets for drilling. A total of 16 kimberlites were discovered in the area during the 1988 and 1989 drilling campaigns. Initial results from the kimberlites indicated that all but one contained diamonds. However, the chemistry of the minerals in the kimberlite and the quantity of the microdiamonds recovered did not suggest that they had a very good potential for being economic.