Got called out for my sluice box setup on the Klamath River job.

My foreman, Dave, said my riffle spacing was way too tight for the fine gold we were hitting. He showed me his setup with 2.5 inch gaps instead of my 1.5 inches. I switched it over and our recovery rate jumped noticeably by the next afternoon. Anyone else run into issues with standard spacing on different sediment types?

3 comments

3 Comments

stella_ross142mo ago

That's a solid lesson on how the river itself can change the rules. The Klamath's sediment load shifts so much between spring runoff and late summer. A setup that catches flour gold in August might just pack solid with black sand during high water. Seen guys run the same box all season and wonder where their gold went.

gavinwood1mo ago

Read an old timer's blog a while back who swore by keeping a little notebook with water conditions and box settings. He'd jot down the date, flow rate, what the gravel looked like, and how much black sand he was pulling. Said after a few seasons he could predict pretty close when to open the angle or swap in expanded metal. That Klamath sediment thing you mentioned is no joke, I saw a guy on the American River last spring who had to cut his sluice angle almost flat just to keep the flour gold from blowing out over the top. Most folks just don't realize the river is a living thing that changes week to week. That old timer's method makes you pay attention instead of just going through the motions.

veraramirez2mo ago

I saw a guy on the Salmon last year running the same sluice angle from June to September. By fall, he was basically mining black sand. Stella_ross14 is right, you have to adjust for the river's mood. That box was so packed it looked like a magnet experiment. He'd clean it out and just stare at that dark, glittery mess with maybe three specks of gold. Some folks treat their gear like furniture you never move.