TIN DEPOSITS OF THE YOEK KEGION, ALASKA. [no. 229. 
luxullianite consists largely of feldspar and quartz, while in this rock it 
is largely calcite. 
Four samples of rock from the north side of Ear Mountain were 
assayed for traces of tin by Mr. Sullivan of the Survey. While none 
of them carry tin in commercial quantities, traces of tin, estimated at 
a few hundredths of 1 per cent, were found in all of them. A pros- 
pecting shaft, it is reported, was sunk on one of these dikes, and 
samples obtained from considerable distance below the surface were 
found to be largely made up of dark mica and tourmaline. It is also 
reported that stream tin has been found in several of the creeks that 
head in Ear Mountain. 
HOT springs. a 
This locality is 70 miles northeast from Port Clarence, about 30 
miles southeast from the head of Shishmaref Inlet, and 30 miles from 
deep water on Goodhope Bay. It takes its name from a group of hot 
sulphur springs, well known to prospectors and miners, around which 
there is usually a small village of tents. 
In summer time the usual route of travel to this locality is by way 
of Imuruk Basin and the Kuzitrin and Kugruk rivers. If tin deposits 
of value should be discovered in this vicinity a road would probably 
be constructed to Goodhope Bay. The general bed rock of this 
vicinity is graphitic mica-schist, but at Hot Springs this schist is 
intruded by a large body of granite several miles across. The granite 
is of the same general type as that of Ear Mountain, but it has not 
been examined microscopically. In Professional Paper No. 2 two 
characteristic landscapes within this granite area are shown on Pis. 
VIII and IX. 
Since the discoveries of tin ore were made in the granites of the 
York region, prospectors have turned their attention to this area, and 
samples of tin ore purporting to come from it were brought to Nome 
late in the season of 1902. 
ASSES EARS. 6 
Near the headwaters of the western tributaries of Pinnell River, in 
the region south of the eastern extension of Kotzebue Sound, are a 
number of small isolated areas of granite, surrounded by massive 
crystalline limestones. These granites have been more resistant to 
weathering than the limestones, and stand out as prominent hills or 
buttes. One of these forms the well-known landmark called the 
Asses Ears, which was so named by Kotzebue in 1816, because "its 
summit is in the form of two asses' ears." A few miles to the north- 
" < 'oilier. A. .!.. A reconnaissance of the northwestern portion of Seward Peninsula, Alaska: Prof. 
Paper I". S. Geol. Survey No. 2, 1902, p. 55 
''This note is furnished by Mr. Fred H. Moffit, in advance of his report on "A reconnaissance of 
the northeastern portion of Seward Peninsula." 
