The R502 series of maps has been replaced by the National Topographic Map Series (NTMS). The R502 series consists of 542 map sheets and covers Australia at a scale of 1:250,000. It was compiled from aerial photography, but only about one quarter of the series was contoured. The standard sheet size is 1 degree of latitude by 1.5 degrees of longitude. Transverse Mercator map projection and Clark 1858 datum were used. Coverage of the country was completed in 1968.

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This work was prepared on a request to provide field infonnation on the Williams and Naraku Batholiths, which I visited in a series of short field trips in 1978, 1984, 1985, 1986 and 1988. I have only included data on the post D2 phases. I have included very little information on the Naraku Batholith, primarily because I have not done all that much work on it since my initial sampling trip in 1978. Five traverses are documented which focus in particular on the altered phases of the Williams Batholith and some albitite intrusions in the Naraku Batholith. My last trip to this area was in 1988, and since then, as there has been a considerable amount of exploration work done in the area, the access information may not be all that reliable. As far as is possible, I have recorded access as it was in my last visit, and I take no responsibility for accuracy, as I have not had the luxury of checking its current status. The five traverses documented are as follows: Traverse 1-Wimberu Granite Traverse 2 - Northern Squirrel Hills and southern Mount Angelay Granite Traverse 3 - Hampden Mines to northern Mount Angelay Granite and Cloncurry Traverse 4 - Tank Hole Bore and Glen Eva Homestead area Traverse 5 - The southwestern plutons of the Williams Batholith In the accompanying documentation I have provided a preprint of an article on the Williams Batholith from the next issue of the BMR Research Newsletter. It provides an overview of the Williams granite system and in particular refers to the concept of convective fractionation. I suggest that this article, as well as the article on "Granites: their tectonic and met allogenic applications" are mandatory reading before setting foot on any of the localities described in this report. I have also included a copy of the BMR regional radiometrics, as it is invaluable in determining the location of the fractionated phases. It is a hand coloured copy of the original diagram which appeared in the Bulletin on the Duchess-Urandangi Region. Finally, for anyone attempting to follow though on the traverses described in this area, remember that the Williams and Naraku Batholiths are the most interesting and spectacular batholiths that I have ever worked on. The diversity in primary magmatic phases and the overprinting alteration types is almost unique, and their association with Cu and Au mineralisation in the area is without question.

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This is a compilation photoscale set of SE53-03.

80% coverage south margin missing 22-1/J55-10/5 Vertical scale: 300

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Restricted on advice from A. Barrett

Restricted on advice from A. Barrett