Dutton is a historical mining camp at the mouth of Ptarmigan Creek, at the head of Cottonwood Bay on the west coast of lower Cook Inlet, about 78 miles (126 km) west of Homer and 18 miles (29 km) southeast of Pedro Bay, Alaska. Ptarmigan Creek flows east for 10 miles (16 km) through the Chigmit Mountains, a subrange of the Aleutian Range that includes the 10,016-foot (3,053 m) Mount Iliamna. The mining camp was named for George W. Dutton who was its first postmaster in 1905. Cottonwood Bay extends about 2.7 miles (4.3 km) west from Iliamna Bay. The local bedrock is Late Triassic. The Cottonwood Bay Greenstone, a volcanic unit named for exposures near the bay’s head, meets Kamishak Formation limestone at the Dutton prospect. The contact hosts a skarn deposit that is probably Jurassic in age. During the Last Glacial Maximum, ice filled nearly all of the Cook Inlet basin, shaping the valleys and coastline around the camp.

The Dutton prospect was discovered in 1901 at an elevation of about 2,000 feet (610 m), 2.5 miles (4 km) northeast of Meadow Lake. It was explored intensively until about 1910 by the Dutton Mining & Development Company, a company formed by George W. Dutton, Silas J. Goodro, and Pierce Thomas. Some claims, including a 12-claim group called Karen, were patented. Reported assays from the period were high. In 1912, George C. Martin and Frank J. Katz of the U.S. Geological Survey reported 4 to 6 percent copper, 6 to 13.5 percent lead and up to 2 ounces of silver per ton. The region’s Indigenous people were the Dena’ina Athabascans, whose traditional territory stretched from the Kuskokwim River to Lake Clark and across Cook Inlet to the Kenai Peninsula. An ancient trail linked the head of Cottonwood Bay with Old Iliamna village, about 20 miles (32 km) away. Old Iliamna’s residents moved to present-day Iliamna in 1935. In 1905, several cabins belonging to prospectors and traders stood at Iliamna and Cottonwood bays. They were occupied mainly when a supply boat was expected or freight was moving inland.

Dutton is no longer worked. Mindat records no current development, but one adit remained open when geologists described the rocks in 1981. The prospect lies in the same region as the Pebble copper-gold-molybdenum-silver-rhenium deposit, about 17 miles (27 km) from the villages of Iliamna, Newhalen and Nondalton. Pebble has been stalled for years. In 2020 the US Army Corps of Engineers denied the permit, a decision that rested on the project as a whole, including a port at Diamond Point. A 2024 review of the application described four main components: the mine site, the Diamond Point port, the transportation corridor and a natural gas pipeline across Cook Inlet. In 2023 the Environmental Protection Agency restricted the project by blocking the disposal of mine waste in certain Bristol Bay waters under Section 404 of the Clean Water Act. Meanwhile, the Igiugig Village Council and a subsidiary of Bristol Bay Native Corporation have long held a rock quarry at Diamond Point, on the northern shore of Cottonwood Bay, and recently developed a village barge landing there. The landing offers an alternative to Williamsport, where tides limit barge access to the Lake Iliamna villages. Read more here and here. Explore more of Dutton and Cottonwood Bay here: