THE scheelite-gold deposits of Otago occur payable in only two known districts-Macrae's Flat (Waihemo County) and Glenorchy (Lake County) (Fig. 1). Broadly speaking, there are two main systems governing the metallurgical treatment, which are - (1) those running primarily for a scheelite product, gold as secondary, aenorchy with coarse crushing ; and (2) those giving preference Racraesfiat. to gold-saving, scheelite as a by-product, fine Dunedin . crushing. Mines operating in the Glenorchy district are primarily scheelite savers, while those of the Macrae's Flat district aim for a high gold extraction. Of the numerous mines that have been exploited past the primary stage, only three have ever reached the stage of constant and steady production, and, strangely enough, these three are, as far as treatment is concerned, opposed to one another. These three mines are the Glenorchy mine of that district, and the Golden Point and the Highlay mine of the Macrae's Flat district. Many other propositions have at different times shown promise, but, owing to their not being able to obtain a constant production, due to the patchy deposition of the scheelite, have been compelled to close down.