Dredging in the Sumpter Valley

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Initial Design

Creation

In 1912, a Yuba-style dredge was created in the south of the city.

It stood at 100 meters long and 45 feet wide and it was all made out of wood!

It was later shut down later on in 1924 by the company.

Plan

A dredge was wanting to be built across Sumpter Valley, Cracker Creek and Powder River. This occurred in Oregon, U.S.A.

The Powder River Gold Dredging Company wanted to build the dredge to use it for gold mining in those areas, as you can tell from the company's name.

Dredge #2

Rebranded

This dredge operated until 1923, as the company had broken the machine down to pieces.

The pieces were then shipped to Washington in the United States of America, to be rebuilt and renamed to Liberty Dredge.

The Powder River Gold Dredging Company decided to create a second dredge after 3 years from building the first one.

They had kept it similar to the first one, but this one only carried 7 1/2 cubic feet, instead of 9.

The Influence

Improvements

The dredge had many changes made to it for the better.

The dredge was larger, ran more buckets per minute, but it took twenty men to run the operation, but only 3 were necessary...

3. The Winchman

2. The Rear Oiler

1. The Front Oiler

Demand

Everyone was quiet about dredging as it wasn't so popular anymore, until 1934.

President Franklin D. Roosevelt had raised the value of gold by $15.00 ($20.00 - $35.00) and this influenced the dredging company to create a new one!

How it Worked

Process

The Dredge

1. Through an electric motor, a dredging bucket line would go down 65 nine cubic feet and dig at a speed of 21 buckets/minute!

2. The buckets would then dump the gold-laden into a hopper at the top of the dredge, which would be flushed forward by 36 feet by water into a trommel (a metal drum which rotates).

3. As the the material turned, another water line would "wash" it. This would result in the smaller pieces of material to drop down to the trommel's shell, while larger pieces continued towards the stacker.

4. The larger pieces would then go to the end of the dredge to be put into the piles of tailings out back.

5. The smaller pieces would be flushed by sluice boxes that had slats called riffles which would cause heavy materials like gold to be trapped, while lighter opens would also go out back.