What it does
Currency Determination No. 1 of 1998, made under subsection 13A(1) of the Currency Act 1965, prescribes the physical and design specifications for a set of Australian gold coins referred to in the Schedule (Sch, Part 1). Mechanically, the Determination does three things.
First, clause 3 formally links a set of denomination/composition entries in the Schedule to precise manufacturing tolerances: for each denomination the Determination specifies (a) the standard weight and allowable variation in grams; (b) the diameter and thickness in millimetres; and (c) the design codes that are then explained in Part 2 of the Schedule. The denominations listed are $5 (1/20 oz), $15 (1/10 oz), $25 (1/4 oz), $50 (1/2 oz), $100 (1 oz) and $200 (2 oz), each described as being of "Not less than 99.99% gold" (Sch, Part 1, Columns 1-2; see also the weight entries in Column 3 and the dimensions in Column 4).
Second, the Schedule translates shorthand design codes into textual design prescriptions (Sch, Part 2). The codes S1 (shape), E1 (edge), O1 (obverse) and R60 (reverse) map to detailed visual and inscription requirements. For example, O1 requires a circle of raised beads inside the rim enclosing the inscriptions "ELIZABETH II" and "AUSTRALIA", and an inscription stating the dollar amount in Arabic numerals followed by the word "DOLLARS", surrounding an effigy of the Queen. R60 requires the inscription "THE AUSTRALIAN NUGGET X OZ. 9999 GOLD" (where X is the nominal weight in ounces written as a common fraction or whole number in Arabic numerals), the year (1998 or 1999), a representation of a joey kangaroo and, depending on the year, either the inscription "P" (for 1998) or "P100" (for 1999), superimposed on a sunburst design (Sch, Part 2).
Third, clause 4 expressly preserves other determinations of coin specifications: "This Determination does not affect any other determination of the specifications of a coin." That means this instrument operates alongside other currency determinations rather than replacing them.