It depends on the country. In Canada, there is a limit on the quantity of coins, above which they are not legal tender.
(2) A tender of payment in coins referred to in subsection (1) is a legal tender for no more than the following amounts for the following denominations of coins:
(a) forty dollars if the denomination is two dollars or greater but does not exceed ten dollars;
(b) twenty-five dollars if the denomination is one dollar;
(c) ten dollars if the denomination is ten cents or greater but less than one dollar;
(d) five dollars if the denomination is five cents; and
(e) twenty-five cents if the denomination is one cent.*