I think I am a genius for thinking of it too. It is the way to focus on areas. And yes, there are some hummdinger areas totally untouched as of yet.. well sort of. In fact DeBeers started in some of these areas back in the sixties in Canada. What are the alkaline rocks? Picritic basalts, dunites, lamprophyres, carbonatites, lamproite, calk-alkaline volcs, and etceterite. The last if my favourite category as it includes all the rocks that fit but you haven't thought of. Just about every gold area has these ultramafic high potassium alkaline rocks. Of course they include many rocks that are unproductive, like minette, lamprophyre, alpine perditotite, carbonatite, and the many varieties of non diamondiferous lamproite. What these signal though, is the tapping of the carbonate layer of the mantle. What you do is go outward from there along the predominant fracture systems, looking for blows, by mag, radioactivity (30% of australian kimberlites are radioactive and many of the NWT kimberlites come to the surface), infrared and till layer sampling.
The GSC was able to find most alakaline areas in the NWT by surface sampling. Many still lie in Quebec, Ontario, Manitoba and Labrador, over the breadth of the province. Colorado, Wyoming, Missouri, Wisconsin, Michigan, New York, and Kentucky have many examples. The world's largest alkaline dyke system exists in eastern Ontario.
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