276 FANNING, 
property, and altogether some 50 tons have been developed. 
However, the costs of mining, shipping, and smelting are so 
high as to preclude the possibility of profit. The shaft and tunnel 
were sampled, and the results of the assays are shown in Table II. 
TABLE II.—Assay of samples taken on the Marshall workings.* 
Sample No.— ni ‘Gold Lely scone Remarks. | 
Pesos. Per cent. 
none none trace 
trace none 6.0 
none nope trace 
none none none 
none none none 
none none trace | Zinc present. 
1.24 trace 15.6 | Zine present. 
none none 0.5 
noue none none 
none none none 
none none trace 
none none trace 
none 
1.60 trace 8.8 | Antimony and zinc present. 
Shaft grab___ 1.24 trace 9.7 | Zine present. 
8 For position of sample numbers see the sampling plan on page 723. 
Iron.—The Camagsinala iron claim lies 5 kilometers west of 
Sual on the Alaminos road, and was stated to contain a “vast 
deposit of high grade iron ore.” Investigation showed the for- 
mation to be andesitic, covered by the usual tropical iron-stained 
soil, and the only evidence of iron ore was a few scattered grains 
of magnetite and hematite which have resulted from the decom- 
position of the andesite. The deposit is of no value. 
Manganese.—One of the features of the reconnaissance was 
the examination of the manganese deposit. The specimens pre- 
viously submitted to the Bureau of Science for analysis were so 
high in manganese content as to warrant close investigation. 
The deposit is located on the north end of the Marshall group 
of claims at Barlo, and was found to consist of a few boulders 
and numerous pebbles and grains of psilomelane and pyrolusite 
strewn over the ground. The deposit is residual, and has re- 
sulted from the decomposition of the sedimentaries or andesite, 
and subsequent concentration along gullies. The higher specific 
gravity of the manganese compared to that of the andesite has 
made this concentration possible. Analysis of one specimen 
gave the following results: 
