THE MINERALS OF IDAHO 19 



29. Highland Valley. Au(D,Pl.). 



18 miles ESE. Boise, O. S. L. R. R. 



Granite cut by granite porphyry. 



Veins. 



Min. Res. 1908, pt. 1, p. 414. 



1909, pt. 1, p. 345. 



Top. sheet Boise. 



Folio 45, 1898. 



30. Idaho City (Idaho Basin). Au, monazite (D, PI.). 



36 miles NE. Boise, O. S. L. R. R. 



Granite cut by aplite and lamprophyres. 



Veins, stream gravels. 



Lindgren, W., The mining districts of Idaho Basin and Boise Ridge, 



Idaho. Eighteenth Ann. Rept., pt. 3, 1898, pp. 617-744. 

 Min. Res. 1905, pp. 228-229. 



1906, pp. 253-254. 



1907, pt. 1, p. 293. 

 1909, pt. 1, p. 344. 



Top. sheet Idaho Basin. 

 Moore Creek. (See No. 25.) 



31. Payette River placers (Jacobs Gulch). Au (PI.). 



Stream gravels. 

 Min. Res. 1908, pt. 1, p. 419. 

 1909, pt. 1, p. 345. 

 Top. sheets Garden Valley, Squaw Creek. 



32. Quartzburg (Idaho Basin). Au, monazite (D, PI.). 



51 miles NNE. Boise, O. S. L. R. R. 



Granite cut by diorite porphyry. 



Veins, stream gravels. 



Lindgren, W., The Mining districts of Idaho Basin and Boise Ridge, 



Idaho. 18th Ann. Rept., pt. 3, 1898, pp. 617-744. 

 Min. Res. 1905, pp. 228-229. 



1906, pp. 253-254. 



1907, pt. 1, p. 293. 



1908, pt. 1, pp. 418-419. 



1909, pt. 1, p. 344. 

 Top. sheet Idaho Basin. 



33. Summit Flat (Pioneerville). Au, Ag. 



50 miles NNE. Boise, O. S. L. R. R. 



Granite cut by aplite and lamprophyre. 



Veins. 



Lindgren, W., The mining districts of Idaho Basin and Boise Ridge, 



Idaho. 18th Ann. Rept., pt. 3, 1898, pp. 617-744, p. 695. 

 Min. Res. 1907, pt. 1, p. 294. 



1908, pt. 1, p. 420. 



1909, pt. 1, p. 345. 



Top. sheets Idaho Basin, Garden Valley. 



34. Twin Springs. Au (PI). 



41 miles East of Boise, S. L. R. R. 



Stream gravels. 



Top. sheet Twin Springs. 



