What it does
Currency Determination No. 3 of 1997, made by the Assistant Treasurer under subsection 13A(1) of the Currency Act 1965, prescribes the physical specifications and designs for a set of silver coins and brings those specifications into legal effect on 9 June 1997 (see front matter; cl 1; cl 2). The Determination operates by reference to a Schedule, which in Part 1 lists the denomination, standard composition, standard weight and allowable variation, dimensions (diameter and thickness), and symbolic design codes for obverse, edge and reverse for each coin type (cl 3; Schedule Part 1). Part 2 of the Schedule explains the symbolic codes used for shape, edge, obverse and reverse and sets out the full textual descriptions that the codes abbreviate.
Mechanically, the Determination does three things in the operative text. First, it sets a binding specification for a class or classes of coin "of a kind having the denomination and standard composition specified in columns 1 and 2, respectively, in Part 1 of the Schedule" by specifying the "standard weight, and allowable variation" (column 3), and "the dimensions" (column 4), and the design (column 5) for that coin (cl 3(a)-(b); Schedule Part 1). Second, it fixes the commencement date for these specifications as 9 June 1997 (cl 2). Third, it expressly states that this Determination "does not affect any other determination of the specifications of a coin" (cl 4), so it is declared to sit alongside prior and future determinations rather than supersede them.
The Schedule implements the specification in detail. For four $1 coins, the document specifies 99.9% silver composition, a standard weight of 31.635 grams with tolerance ±0.50 g, a diameter of 40.60 mm and thickness of 4.00 mm, shape code S1 (explained as circular), edge E1 (milled), obverse O1 (text and effigy description), and reverse codes R39-R42 (different reverse motifs each showing "THE AUSTRALIAN KOOKABURRA 1OZ. 999 SILVER", "1997" and a kookaburra motif with different cameo devices such as a dragon, phoenix, Edison reference, Oldsmobile 100th anniversary). For a $30 coin the Schedule specifies 99.9% silver composition, a standard weight of 1002.502 grams with tolerance ±1.50 g, diameter 101.00 mm, thickness 14.60 mm, same shape S1 and edge E1, obverse O1 and reverse R43 (a 1 kilo kookaburra with a Walking Liberty Half Dollar representation). The Schedule also declares in words the inscriptions and design elements that the abbreviated design codes represent (Schedule Part 2).