Art. X.] Watson, Yellow Ochci- Deposits of Georgia. 







I. Ciiule ochcr from Mansfield Iholliers' ]jro]jerly. Lot Xo. 462, 4th Dis- 



trict, 3d Section, Bartow county, (ieorgia. 



II. Crude ocher from the John P. Stegall property, near Knierson, Hartow 



county, Georgia. 



III. IV, V and VI. Refined oclier from the l.lue Ridge Ocher Company's 



property. Lot No. 490, 4th District, 3d Section, Bartow county, 

 Georgia. Furnished by courtesy of the Manager, Captain John Pos- 

 tell, Cartersville, Georgia. 



VII. Refined ocher from the Cherokee Ocher & Barites Company's prop- 

 erty, one mile east of Cartersville. Furnished by courtesy of the 

 President, Mr. T. W. Baxter, Atlanta, Georgia. 



VIII. Refined ocher from the American Ocher Company's property. Lot 

 No. 475, 4th District, 3d Section, Bartow county, Georgia. Furnished 

 by courtesy of the Manager, Mr. Waite, Cartersville, CJeorgia. 



The anal}-ses arc sufficientl}' explanatory, and attention 

 need only be called to one feature, namely, the high percentage 

 of ferric oxide. Assuming all the ferric oxide to be combined 

 with water ^ in the proportion to form limonite, and calculating 

 on this basis the percentage amount of limonite in each analy- 

 sis, we find an av^erage of 78.33 percent, for the eight analyses. 

 This means that about one-fourth of the entire product consists 

 of foreign mineral matter, in the form of impurities that can- 

 not be separated from the hydrous iron oxide (ocher) by the 

 present methods of cleansing. Field- and laborator}'-studies 

 show this admixed mineral matter to consist largely of clay and 

 very finely divided quartz-particles, with, in many cases, smaller 

 amounts of manganese oxide. Notwithstanding these facts the 

 yellow ocher of the Cartersville district is one of the very best 

 mined in the United States, and is the equal of most of the for- 

 eign ochers of this color. 



Mode of Occjirniice of the Ocher. 



As previously defined, the yellow ocher belt in Bartow 

 county is entirely limited to the Weisner quartzite of lower 

 Cambrian age. Field-study shows that the ocher occurs in both 

 the hard and fresh quartzite and in the residual clays derived 



1 Only in one case, analysis II of the table, is there sufficient water indicated 

 in the analyses to satisfy all of the ferric oxide according to the formula 2Fe.^Oj. 

 3H,0. 



