The equivalent term used in searching for opal is noodling.
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- "Noodling: The practice of sifting through rejected mullock heaps for small pieces of precious opal inadvertently discarded by the miners. A number of people on the opal fields rely entirely on noodling for a living. They either sift through the waste material by hand ... or use a noodling machine. These people are 'professional' noodlers. Tourists and others casually searching the dumps for pieces of opal are also noodling."
Read more about this topic: Fossicking