Nugget

(redirected from Nuggets)
Also found in: Dictionary, Thesaurus, Medical, Financial, Idioms, Wikipedia.

nugget

[′nəg·ət]
(geology)
A small mass of metal found free in nature.
(metallurgy)
A weld bead.

Nugget

 

a comparatively large mass of native metal (gold, silver, platinum) in ores and placer deposits. Nuggets are rare and are usually distinctly larger than the great majority of particles of the native metals. Their weight, as a rule, exceeds 1 g. The largest gold nuggets, which were found in Australia, include the Holtermann nugget (285 kg with quartz, 83.3 kg of pure gold) and the Welcome Stranger nugget (70.9 kg with quartz, 69.6 kg of pure gold). The Diamond Fund of the USSR contains such gold nuggets as the Bol’shoi Treugol’nik (36.2 kg) and the Verbliud (9.29 kg). Large platinum nuggets have been found in the dunites (0.427 kg) and placers (9.639 kg) of the Nizhnii Tagil massif of the Central Urals.

The morphological characteristics of the nuggets of noble metals derive from the shapes of the enclosing cavities; only rarely does the development of the metals’ own crystalline forms play a part. Distinctions are made between nugget crystals, nugget concretions, nugget dendrites, fissured and cemented accumulations, included quartz fragments, “casts” of drusy cavities, and nuggets with mixed shapes. The liquids passing over nuggets in placers cause the nuggets to acquire rounded shapes. It is commonly believed that most nuggets were formed in the process of ore formation from hydrothermal solutions. Nuggets from the “head” of ore shoots and from the zone of oxidation of certain ore deposits are the richest. Special devices—electronic nugget-catchers—are mounted on scrubbers to remove nuggets from placers.

REFERENCES

Betekhtin, A. G. “Mineraly gruppy samorodnoi platiny.” In Mineralogiia Urala, vol. 2. Moscow-Leningrad, 1941.
Soboevskii, V. I. Zamechatel’nye mineraly. Moscow, 1971.
Petrovskaia, N. V. Samorodnoe zoloto. Moscow, 1973.

N. V. PETROVSKAIA

nugget

In seam welding, spot welding, or projection welding, the weld metal which joins the parts.
References in classic literature ?
If you stay, I'll show you the biggest nugget that is the father of all other nuggets.
That's what those kangaroo-hunters call a nugget," boomed over my shoulder directly at the largest of the specimens.
If a really big nugget, or nugget- finder, elects to blush unseen--"
I've been travelling toward the nugget right along--"
Now, Sarah," her towering giant of a husband begged, "I just got to mention her or I can't tell about the nugget.
When I got home, Paloma put a fat nugget of gold into my hand, which Vahna had sent him for.
And the Kiondiker threw down his pelts and nuggets as dross, and let his jaw fall half-way, and stared at her.
Gaily, roaringly, irresistibly, in jolly-good-fellow style, we dragged him from the restaurant to a cafe, stuffing his pockets with his embalmed birds and indigestible nuggets.
And then we had him carted to a distant small hotel and put to bed with his nuggets and baby seal-skins stuffed around him.
Each day they worked earned them thousands of dollars in clean dust and nuggets, and they worked every day.
That ring with the rough nugget on it was above it, and the twisted snake ring on the third finger.
Then the murderer, or whoever it was, first took off this ring you call the nugget ring, then the wedding ring, and afterwards put the nugget ring back again.