"To be sure, much seems to depend on the city and the particular weight involved. For example, a "double Tarn" is twice the weight of a "tarn." It seems there are usually eight tarsk bits in a copper tarsk, and that these are the result of cutting a circular coin in half, and then the halves in half, and then each of these halves in half. An analogy would be the practice of cutting the round flat Gorean loaves of sa-tarna bread into eight pieces. There are apparently something like 100 copper tarsks in a silver tarsk in many cities. Similarly, something like ten silver tarsks would apparently be equivalent, depending on weight, etc., to one gold piece, say, a single "tarn." Accordingly, on this approach, the equivalencies, very approximately, and probably only for certain cities, would be eight tarsk bits to one copper tarsk; one hundred copper tarsks to a silver tarsk; ten silver tarsk to a gold piece, a single tarn. On this approach there would be, literally, 8,000 tarsk bits in a single gold piece.
Magicians of Gor, pg. 469, by John Norman.

Tarsk bit
"The smallest Gorean coin is usually a tarsk bit, usually valued from a quarter to a tenth of a tarsk.
Savages of Gor pg. 120, by John Norman.

"One of the guardsmen opened her mouth, not gently, and retrieved the coin, a rather large one, a tarsk bit. Ten such coins make a copper tarsk. A hundred copper tarsks make a silver tarsk.
Explorers of Gor pg. 54, by John Norman.

"The equivalencies, very approximately and probably only for certain cities, would be eight tarsk bits to the copper tarsk
Magicians of Gor pg. 469, by John Norman.

Copper Tarsk
"One of the guardsmen opened her mouth, not gently, and retrieved the coin, a rather large one, a tarsk bit. Ten such coins make a copper tarsk. A hundred copper tarsks make a silver tarsk.
Explorers of Gor pg. 54, by John Norman.

"The equivalencies, very approximately and probably only for certain cities, would be eight tarsk bits to the copper tarsk, one hundred copper tarsks to a silver tarsk
Magicians of Gor pg. 469, by John Norman.

Copper Tarn Disk:
"Nela was an expensive girl, though there were pools where the girls cost as much as a silver tarn disk. The tarsk is a silver coin, worth fourty copper tarn disks.
Assassin of Gor, pg. 160, by John Norman.

Silver Tarsk
"The tarsk is a silver coin, worth forty copper tarn disks. All the girls in the Pool of Blue Flowers cost the same, except novices in training who would go for ten or fifteen copper tarn disks
Assassin of Gor, pg. 160, by John Norman.

"A silver tarsk is, to most Goreans, a coin of considerable value. In most exchanges, it is valued at a hundred copper tarsks, each of which valued, commonly, at some ten to twenty tarsk bits. Ten silver tarsks, usually, is regarded as the equivalent of one gold piece, of one of the high cities
Rogue of Gor, pg. 155, by John Norman.

Gold Tarn Disk:
"One of the central coins on Gor is the golden tarn disk of Ar, against which many cities standardize their own gold piece. Other generally respected coins tend to be the silver tarsk of Tharna, the golden tarn disk of Ko-ro-ba, and the golden tarn of Port Kar, the latter particularily on the western Vosk, in the Tamber Gulf region, and a few hundred pasangs north and south of the Bosk's delta."
Rogue of Gor pg. 155, by John Norman.

Although it is not my policy to include Cabot's marginal notes, jottings, etc., which are often informal, and apparently written at different times, in the text of his accounts, I think it would not be amiss to hypothesize certain approximate equivalencies here. To be sure, much seems to depend on the city and the particular weighs involved. For example, a "double tarn" is twice the weight of a "tarn." It seems there are usually eight tarsk bits in a copper tarsk, and that these are the result of cutting a circular coin in half, and then the halves in half, and then each of these halves in half. An analogy would be the practice of cutting the round, flat Gorean loaves of sa-tarna bread into eight pieces. There are apparently something like one hundred copper tarks in a silver tarsk in many cities. Similarly, something like ten silver tarks would apparently be equivalent, depending on weights, etc., to old gold piece, say, a single "tarn." Accordingly, on certain cities, would be eight tarsk bits to a copper tarks; one hundred copper tarks to a silver tarsk; and ten silver tarsks to a gold piece, a single tarn. On this approach there would be, literally, 8,000 tarsk bits in a single gold piece.
Magicians of Gor pg. 468, by John Norman.

"Ten silver tarsks, usually, is regarded as the equivalent of one gold piece, of one of the high cities
Rogue of Gor, pg. 155, by John Norman.

Gold Tarn Disk, Double weight
"Mintar reached into the pouch at his waist and drew forth a golden tarn disc, of double weight. He threw it to Kazrak
Tarnsman of Gor, pg. 194, by John Norman.