There is a history of some 99 lode mines and 4 placer operations in King County, Washington. This area is primarily a lode gold area, but who knows, maybe you will get lucky.
Baring is located in the north central part of the county and has some history of placer and lode mining. West to the Tolt River in the SE 1/4 section 29 T26N R8E, is the location of the Tolt River Placer. It is reported that in this location you can find fine gold in the top 24″ of river bar material. In section 15 T26N R10E, is the Yellow Jacket Mine. It consisted of 10 claims that produced gold and silver. Southwest of Baring you can find the Climax claims that produced a by product of gold with silver in chalocopyrite.
In section 6 T19N R8E, is the location of the White River Mine and stamp mill. It was operated in 1890 for lode gold.
Grotto is located in the northeast corner of the county. In sections 29, 30 and 31 of T26N R11E is the location of the Money Creek district. The Aaron lode gold mine is located here. In sections 20 and 29, in the stream gravels of Money Creek is the Money Creek Placer Mine. Near the headwaters of Money Creek, in SW 1/4 section 34 T26N R10E, in the Miller River District, is many old mines. The Apex Mine produced gold, copper, lead and sliver. Close by the Apex, in section 33 are the Damon and Pythias Mines, which produced lode gold with lead and copper. In section 30 T26N R11E, is the Bergeson Mine, which produced gold from arsenopyrite ore. In sections 31 and 32, 2 miles from Money Creek, is the Kimball Mine. It produced Lode gold, with antimony and silver. Eight miles up the Miller River from its mouth and 2 miles by trial, in section 13 T25N R10E, is the Coney Basin Mine. It consisted of 14 claims that produced gold as a by product of its copper, lead, silver and zinc mining.
Gold is found along much of the length of the North Fork of the Snoqualmi River. Half mile up Illinois creek in sections 8 and 9 T25N R10E, is the Beaverdale Mine. The Rushing Mine is 6 claims that produced lode gold in the same area. In the Buena Vista district, in section 7 and 18, is the Lennox Mine. It was 45 claims, with bunkhouse, mess hall and stamp mill. Two miles by trail from the North Fork of the Snoqualmi River and about 3.5 miles above the Lennox River, in sections 9 and 10, is the Luck Strike Mine, which produced lode gold, silver and copper. Near the head of the North fork of the Snoqualmi River, in NW 1/4 section 4, is the Monte Carlo Mine. It consisted of 13 claims that produced lode gold and silver. East of there on a dirt road to the Taylor River district, in section 16 T24N R10E, is the Rainy Mine. Near Snoqualmi Pass, on the South fork of the Snoqualmi River, in sections 7 and 8 T22N R11E, is the Carmack Mine. It consisted of 5 claims that produced gold, copper, lead and silver.
West by Northwest, along the Snoqualmi River, in bars and bench gravels is where the Snoqualmi River Placer was operated. If you to North by Northeast, along the Raging River, in the gravel bars you can also find placer gold.
Middle Fork of the Snoqualmie
The Middle Fork of the Snoqualmie River is also called the Taylor River, it is located East of North Bend Washington off of I-90, you access the area by taking exit 34 and proceed North, the road along the river is dirt but well maintained. Watch for gravel bars, I have panned this river with good success in placer gold, also small nuggets have been found.