REVIEWS 479 



A Review of Mining Operations in the State of South Australia 



during the Half-Year Ended December 31, iqio. No. 13. 



Issued by T. Duffield, Secretary for Mines. Adelaide, 191 1. 



Pp. 34; pis. 2. 



This paper gives statistics on leases, claims, subsidies, men employed, 



prices, and various industrial and technical features of the mining 



districts of South Australia. Notes on recent development work, 



including assays of samples and amount of boring, tunneling, etc., done 



on various properties make up a large part of the review. 



An interesting method of draining the southeastern district has been 

 approved by the government geologist. The plan is to sink borings 

 or shafts into a porous stratum underlying the swamp areas and allow 

 the water to escape through underground channels, saving the expense 

 of extensive ditches necessary for surface drainage. Small areas have 

 been drained into natural sink holes with very encouraging results. 



A. D. B. 



Report on the Iron Ore Deposits along the Ottawa {Quebec Side) and 

 Gatineau Rivers. By Fritz Cirkel. Canada Department of 

 Mines, Mines Branch. No. 23, 1909. Pp. 147; plates 5; 

 maps 2. 

 The area covered by this report is about 900 square miles, extending 

 from Ottawa 100 miles up the Ottawa River and 83 miles up the Gatineau. 

 Deposits of magnetite and hematite ore have been known for over 

 sixty years and attempts have been made at various times to develop 

 them, but without success. The present report is the result of a com- 

 prehensive examination of the region to determine the possibilities of 

 development of the deposits. One important factor is the available 

 water power which is described in detail in the appendix. 



E. R. L. 



Maryland Geological Survey, Vol. VIII, iqoq. William Bullock 

 Clark, State Geologist. 

 This volume, which is entirely economic in its nature, contains the 

 following reports: Part I, "Second Report on State Highway Con- 

 struction," by Walter Wilson Crosby, pp. 29-95; Part II, "Maryland 

 Mineral Industries, 1896-1907," by Wm. Bullock Clark and Edward B. 

 Mathews, pp. 99-223; Part III, "Report on the Limestones of Mary- 

 land with Special Reference to their Use in the Manufacture of Lime 



