240 KEMPS ORE DEPOSITS. 



2.12.04. Oregon is an important producer of gold both from 

 placers and from veins. Baker County, on the east, presents the 

 characteristic placers and gold quartz of the California Sierras, and 

 is the most productive section of the State. Grant and Josephine 

 counties also have placers, and smaller amounts come from a few 

 others. In the extreme southeast, near the California line, is 

 Curry County, containing : 



2.12.05. Example 44a. Port Orford. Auriferous beach sands 

 at the foot of gravel cliffs, and shifting with the winds and tides. 

 At Port Orford the ocean has access to great sea cliffs of gravel 

 which it breaks down by the force of the waves. A sorting ac- 

 tion ensues, performed by the undertow and the littoral current. 

 The heavier gold dust is concentrated and gathered up by the 

 miners at low tide. Some submarine work has also been at- 

 tempted. The product is not great, and the deposit is chiefly in- 

 teresting in its scientific bearing. It runs along into California as 

 well. Auriferous sands occur at Yakutat Bay, Alaska. (See J. 

 Stanley-Browne, Nat. Geog. Mag., Vol. III., 1891.) The gold of 

 the Potsdam sandstones of the Black Hills has been concentrated in 

 a similar way in early geologic time, and the magnetite sands which 

 were referred to under 2.03.13 furnish something of a parallel. 1 



Some Points Connected with the Igneous Eruptions along the Cascade 

 Mountains of Oregon," Amer. Jour. Sci., iii. XVIII. 406. J. S. Diller, 

 " Notes on the Geology of Northern California," Bull. 33, U. S. Geol. Sur- 

 vey. J. C. Fremont, " Observations on the Rocky Mountains and Oregon," 

 Amer. Jour. Sci. , ii. , HI. 192. George Gibbs, ' ' Notes on the Geology of the 

 Country East of the Cascade Mountains, Oregon," Amer. Jour. Sci. t ii., 

 XX. 275. J. Leconte, " On the Great Lava Flood of the West, and on the 

 Structure and Age of the Cascade Mountains," Amer. Jour. Sci., iii., 

 VIII. 167, 259. C. King, Fortieth Parallel Survey, Vol. I. J. MacFarlane, 

 Geol. Railway Guide, p. 316. J. S. Newberry, Pacific R. R. Reports, Vol. 

 VI., pp. 1-73. I. C. Russell, " A Geological Reconnoissance in Southern 

 Oregon," Fourth Ann. Rep. Director U. S. Geol. Survey, pp. 435-4G2. 



1 G. F. Becker, Tenth Census, Vol. XIII., p. 27, general account of 

 Oregon. W. P. Blake, "Gold and Platinum from Cape Blanco (Port Or- 

 ford)," Amer. Jour. Sci., ii., XVIII. 156. " Remarks on the Extent of the 

 Gold Regions of California and Oregon," etc., Amer. Jour. Sci., ii., XX. 

 72. A. W. Chase, " The Auriferous Gravel Deposits of Gold Bluffs, Cali- 

 fornia," Cal. Acad. Sci., 1874 ; Amer. Jour. Sci., iii , VII. 367. " Dredging 

 for Gold," Engineering and Mining Journal, June 23, 1883, p. 360. B. 

 Silliman, " Cherokee Gold Washings," Amer. Jour. Sci., iii., VI. 182. W. 

 P. Watts, " Sands in Santa Cruz County, California," Rep. Cal. State Min- 

 eralogist, 1890, p. 622. 



