44 Reviews—Goldfields of Western Australia. 
The writer, mindful that his little book is to serve as a guide, gives 
careful directions from place to place, adding the distance to be 
traversed on each journey that the wayfarer may know what is before 
him. There is a small map at the beginning of the book (scale 
1: 1,000,000) marked with red and blue lines, indicating the main 
routes and their branches described in the text. Its area extends 
approximately from Basel (the starting-point for all the tours) in the 
north-west corner of the map to Leuk in the south-west, and from 
Winterthur in the north-east to Airolo in the south-east. 
AEE F. 
VI.—Gerotocrcat Survey or Western Ausrratta. Bulletin No. 23: 
Tarrp Reporr on tHE Geonogica, Fratures anp MINERAL 
Resources or THE Pirpara Goxprretp. By A. Gres Marrnann, 
Government Geologist. 8vo; pp. 92, with 7 geological maps 
and 13 figures. (Perth, W.A., 1906.) 
ee report contains descriptions of those mining centres in the 
Pilbara Goldfield not referred to in Bulletins 15 and 20. It 
includes full details of the gold-mining centres of Tambourah, Western 
Shaw, North Shaw, and Just-in-time, together with the tin-fields of 
‘Wodgina and Cooglegong. It is fully illustrated with coloured 
geological and mining maps, which help greatly in elucidating the 
text. A general summary is also given of the geological features, 
mineral resources, and future prospects of the Pilbara Goldfield, drawn 
up by Mr. A. Gibb Maitland, mostly from personal investigations. 
The author was assisted in the field-work by Mr. H. W. B. Talbot. 
The occurrence of sections reveals geological structures not met with 
in the more southerly districts, and these also throw much light upon 
problems connected with the geology of other goldfields. 
. The following table exhibits the succession of the rocks met with 
in the Pilbara Goldfield :— 
Recent nae Sat ... Blown sand, alluvium of the river beds, and 
residual deposits. . 
Oakover Beds (age ?) ... Sandstones, limestones, etc. 
Nullagine Beds (age ?) ... Sandstones, grits, conglomerates, and vol- 
eanic rocks. (Gold-bearing in places.) 
Mosquito Creek Beds (age?)... Grits, shales, and fine conglomerates. (Gold- 
bearing in places.) 
Warrawoona Beds (Archean?) Metamorphic sedimentary rocks, quartzites, 
conglomerates, greenstone schists, and 
allied rocks. (Gold-bearing.) 
' Granite and gneiss... ... (Tin- and tantalite-bearing and auriferous 
in places.) 
Dolerite, Diabase, and Gabbro 
Dykes. — 
'. The granite and gneiss are almost everywhere intrusive into the 
oldest rocks of the district. Itis in the granite that the tin veins, and 
also the richest quartz reefs, occur. The total yield of gold of the 
various mining centres up to the end of 1905 amounts to 109,464 oz., 
or an average of 1°71 0z. per ton of ore. As to the future prospects 
of mining in this district, Mr. Gibb Maitland is confident that, with 
