collier.] LODES ON LOST RIVER. 21 
Among the loose material from the croppings of the ledge a large 
piece of galena coated with yellowish alteration products was found. 
This may have come either from the ledge or from the altered lime- 
stone near the contact. An assay shows that it contains 0.08 ounce of 
gold and 7.76 ounces of silver per ton. Both on Tin Creek and on 
Cassiterite Creek tin ore in angular, unworn crystals is reported to 
have been found in the gravels of the stream beds. One specimen of 
placer tin of this kind obtained near the cropping of the large dike on 
Cassiterite Creek consists principally of crystals of cassiterite, but 
contains also wolframite and garnet. 
The tin-bearing dike is readily followed from Cassiterite Creek east- 
ward over a mountain having an elevation of about 1,000 feet to Tin 
Creek, a distance of about 1 mile. At the time the ledge was exam- 
ined, in the latter part of July, 1903, no excavation had been made on 
it, and it was impossible to measure the exact width at any point, but 
surface debris indicated a width of about 100 feet. Since that time 
crosscut trenches have been made on the ledge near Cassiterite Creek, 
and the above estimate is reported to represent the facts. a The cas- 
siterite was found to be distributed through the whole width of the 
dike. 
No attempt will be made to give an estimate of the value of the 
deposit. The development on the ledge has not, as yet, gone far 
enough to allow systematic sampling, and until further excavations 
have been made the grade of the ore and the size of the deposit can 
not be determined. Picked specimens showing as high as 17 per 
cent metallic tin have been assa}^ed, and still higher assays could be 
obtained by careful sorting. From the tests thus far made an average 
of 6 per cent for the whole width of the ledge is claimed. 
The following assays of ore collected on this lode by Governor 
Hutchinson were made by Ledoux & Co., of New York: 
Assay of tin ore from Lost River. 
Per cent tin. 
Sample of ore marked ' ' Dyke " 5. 08 
Sample of ore marked ' ' Float " 15. 70 
Sample of ore marked ' ' Greisen " 4.13 
A partial analysis of one sample of the ore is as follows (No. 7451): 
Partial analysis of tin ore from Lost River. 
Per cent. 
Gold and silver None. 
Lead oxide (lead, 0.028 per cent) 0. 030 
Copper oxide (copper, 0.085 per cent) 106 
Arsenic oxide (arsenic, 0.38 per cent) 580 
Tin oxide (tin, 4. 46 per cent) 5. 74 
o For information regarding developments subsequent to July 31, 1903, the writer is indebted to Gov. 
J. H. Hutchinson, a mine operator, who bonded several of the claims here in September, 1903. The 
facts as given by him are corroborated by others who have visited the locality. 
