Grab dredge, Brisbane River

Queensland State Archives posted a photo:

A grab dredger picks up seabed material with a clam shell bucket, which hangs from an onboard crane or a crane barge, or is carried by a hydraulic arm, or is mounted like on a dragline.

This technique is often used in excavation of bay mud. Most of these dredges are crane barges with spuds.

Description source:
Wikipedia

View the original image at the Queensland State Archives:
Digital Image ID 12423

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BHP Wharf, Brisbane River

Queensland State Archives posted a photo:

First Ship Uses New B.H.P. Steel Wharf

Magnet cranes do quick job

Two mobile magnetic cranes each unloaded nearly a ton of pig iron every 70 seconds from the freighter Balarr in Brisbane yesterday.

The cranes, at the B.H.P.’s new Hamilton steel wharf, were having their first run, and the Balarr was the first ship to use the wharf.

The 108ft. cranes lowered big magnets into the Balarr on 63ft. jibs.

Mounted on steel rails running the length of the wharf, they worked the forward hold (570 tons of pig-iron) and the after hold (800 tons).

Sixty watersiders were assigned to the two intermediate holds, containing 2400 tons.

More powerful magnets would be used later, the B.H.P. Queensland manager (Mr. R. S. Colquhoun) said yesterday.

Description source:
The Courier-Mail, 20 October 1950

View the original image at the Queensland State Archives:
Digital Image ID 12441

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