Leslie Massey
Australia's coins are made at the Royal Australian Mint in Canberra. The minting process begins with an initial design brief, where a team of coin developers, designers, and engineers work together on the coin's look and feel. Once the design is approved, a three-dimensional model is sculpted, and the coin design is cut directly into tool steel using a computer-controlled engraving machine. After the design is cut, sheets of metal are cut into coin-shaped pieces, known as blanks. These blanks are then struck by dies, which press the design onto both sides of the coin. The Royal Australian Mint produces coins of various metals, including aluminium bronze, silver, gold, and bi-metal.
| Characteristics | Values |
|---|---|
| Composition | Copper, Nickel, Aluminium, Silver, Gold, Bi-metal, Platinum |
| Coin Denominations | 5c, 10c, 20c, 50c, $1, $2, $5, $10, $200 |
| Coin Shapes | Circular, Dodecagonal (12-sided) |
| Production Rate | Up to 650 pieces per minute, 2 million coins per day |
| Production Process | Design, 3D modelling, engraving, striking blanks, annealing, pickling, burnishing, pressing, etc. |
| Production Location | Royal Australian Mint in Canberra |
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What You'll Learn
Coin composition
The composition of Australian coins depends on their denomination. The 5c, 10c, 20c, and 50c coins are made of 75% copper and 25% nickel. The $1 and $2 coins are composed of 92% copper, 6% aluminium, and 2% nickel. The original 50c coin was circular and contained 80% silver and 20% copper. However, it was only produced for one year due to its similarity to the 20c coin and the value of the metal exceeding its face value.
The Royal Australian Mint in Canberra produces Australian circulating coins. The minting process begins with a design brief, where coin developers, designers, and engineers collaborate on the coin's appearance. Once the design is approved, a three-dimensional model is sculpted using plaster modelling or 3D modelling software. The coin designer refines the model to ensure the design can be manufactured with the highest quality.
After the model is finalised, it is used to create a master tool, which is a steel model made with a computer-controlled engraving machine. This process can take up to 24 hours. The master tool is then pressed into a softened steel block to create a negative coin or mould. This process is repeated until a final negative is made, from which a production die is created.
The production process involves cutting coin-shaped pieces called blanks from sheets of metal. These blanks are then fed into presses, where they are struck on both sides simultaneously by dies to create the final coins. The dies can strike coins with up to 200 tonnes of pressure, producing up to 650 pieces per minute. The high pressure causes the metal particles to spread and stretch, forming a sharper rim and grooves around the edge of the coin.
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Coin minting process
The coin minting process in Australia, carried out by the Royal Australian Mint, involves several intricate steps, from design to distribution.
Design and Modelling
The process begins with an initial design brief, where product developers, coin designers, and engineers collaborate to create an image that will translate well onto a coin. Once the design is approved, a three-dimensional model is sculpted using traditional plaster modelling tools or 3D modelling software. Refinements are made to the model to ensure the design can be manufactured to the highest quality.
Creating the Reduction Punch
Once the model is finalised, the manufacturing process starts. The coin design is cut directly into tool steel using a computer-controlled engraving machine, creating a reduction punch. This process can take up to 24 hours. The reduction punch contains a raised or relief impression of the complete coin design.
Hobbing and Die Creation
In a process known as hobbing, the reduction punch is placed in a hydraulic press, and the design is transferred onto a softened steel block using 100 to 400 tonnes of pressure. This creates a master die with a negative impression of the coin design. The master die is then used to create a working hob, which has a positive impression of the design. The final hobbing step involves hardening the working hob and using it to create the production die, which has a negative impression again. The production die is used to strike blanks, transforming them into coins.
Blanks Preparation
Sheets of metal are cut into coin-shaped pieces called blanks. These blanks will become coins once struck by dies. Blanks are typically round, but Australia's 50-cent coin blank is dodecagonal (12-sided). Blanks are rolled through a specially shaped groove, creating a raised edge that assists in the coining operation by partially forming the rim. Blanks for proof coins undergo additional treatments, including annealing (controlled heating), pickling in hot acid, and burnishing for a smooth surface.
Striking and Pressing
The Mint's fitters and machinists install the dies in the coin presses. The blanks are then fed through the presses and struck simultaneously on both sides by the dies. The dies can strike with up to 200 tonnes of pressure, creating a sharper rim and transferring any serration from the press' collar to the coin's edge. The uncirculated coin press can make up to 80 coins per minute, while proof coins are made with higher pressures of 180-360 tonnes, requiring manual operation.
Distribution
Finally, the minted coins are counted, bagged, and weighed to ensure accuracy. The small bags are packed into larger bags, which are then sealed into boxes. Circulating coins are stored in the Mint's vaults until delivery trucks transport them securely to banks. Uncirculated and proof coins are individually packaged and delivered to the Royal Australian Mint's shop, eShop, or authorised dealers.
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Coin design
The Royal Australian Mint in Canberra produces Australia's circulating coins. The process of designing a new coin is a collaborative effort between the Mint's product developers, coin designers, and engineers. They work together to create a design that will translate well onto a coin. Once the design is approved, a three-dimensional model is sculpted using either traditional plaster modelling tools or 3D modelling software. The coin designer refines the model, ensuring that the final product can be manufactured to the highest quality.
After the model is finalised, it is sent for the cutting of a master tool, and the manufacturing process begins. A computer-controlled engraving machine is used to cut the coin design directly into tool steel, creating a reduction punch. This process can take up to 24 hours. The reduction punch contains a raised or relief impression of the complete coin design.
To create the coin-making tools, a steel model called a master tool is made from the finalised model. This process is done using a computer-controlled engraving machine and takes around 24 hours. The steel model is then placed into a strong press, and the design is pressed into a softened steel block using 100-400 tonnes of pressure. This results in a negative coin or a mould, where the raised features on the coin would be hollowed out in the negative. This process of making a model and a negative is repeated a few times until a final negative is made of the appropriate steel type.
The coin presses can produce different denominations and may make several denominations per day. Blanks, or coin-shaped pieces, are fed through the presses and struck on both sides simultaneously by dies. The dies can strike coins with up to 200 tonnes of pressure, producing up to 650 pieces per minute. The pressure of the strike causes the metal particles to spread and stretch, creating a sharper rim and grooves on the edge of the coin.
The Royal Australian Mint also releases collectible coins, which are legal tender and can be used as currency or converted to standard coinage at a bank. These collectible coins include the 1980-1994 gold two-hundred-dollar coin series and nugget coins issued in various weights and denominations.
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Commemorative coins
The Royal Australian Mint has been issuing Australian commemorative coins since 1927. Commemorative coins mark events, people, or organisations that have significantly impacted Australia or other unique aspects of Australian life. These coins are produced for various denominations and their imagery replaces the usual design on the reverse side of the coin. In some cases, all the coins of a particular denomination will be replaced with a commemorative design for that year, while in other cases, only a few million coins will feature the commemorative design, with standard-design coins also being released.
The Royal Australian Mint regularly releases collectible coins, which are legal tender and can be used directly as currency or converted to "normal" coinage at a bank. Metals used for these coins include aluminium bronze, silver, gold, and bi-metal. Some of the most famous collectible coins include the 1980–1994 gold two-hundred-dollar coin series. Commemorative coins are produced using the same minting process as standard coins, with the coin designers and engineers collaborating to create an image that will translate well onto a coin. Once the design is approved, a three-dimensional model is sculpted, and the manufacturing process begins.
The Royal Australian Mint invites submissions from the public for future commemorative coin themes. The development process for a coin can take up to two years, so themes that stand the test of time are preferred.
Australia's first commemorative $2 coin was released in 2012 to commemorate Remembrance Day. It features a poppy in the centre on a background of microtext, reading: "REMEMBRANCE DAY" and "LEST WE FORGET". Australia is the second country to circulate coloured commemorative coins, after Canada.
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Collectable coins
The Royal Australian Mint regularly releases collectible coins, which are all legal tender. Metals used in these coins include aluminium bronze, silver, gold, and bi-metal. Some of the most notable collectible Australian coins include:
The 1980-1994 Gold Two-Hundred-Dollar Coin Series
This series of coins is one of the most famous collectible Australian coins. The coins are made of gold and are denominated in dollars.
Nugget Coins
Nugget coins are issued in troy ounces, fractions or kilograms, and are made of gold or platinum. Some are denominated in dollars, while others are valued based on their weight.
The 1930 Penny
Collectors have always been drawn to the 1930 penny due to its low mintage, rarity, and the mystery surrounding it. Even in low-grade circulated condition, these pennies can be worth hundreds of thousands of dollars.
The 1988 Fifty-Cent-Proof Silver Coat of Arms
The 1988 fifty-cent coin is a rare decimal currency coin. It was minted to commemorate the 200th anniversary of the British Settlement, and it replaced the standard 50c coin that featured a Coat of Arms for only one year.
The 1967 $1 Goose Coin
The $1 Goose coin was struck by the Royal Australian Mint as a proof coin. Due to its rarity and historical significance, it attracts a premium. A gold piece sold for $29,000 in 2017, while a silver-proof coin, less rare than the gold version, was auctioned for $5,000.
The 1852 Adelaide Pound
The Adelaide Pound is Australia's first gold coin, making it very popular among collectors. Only about 250 examples are known to exist today, adding to its value as a collectible.
The 1972 5c Coin
The 1972 5c coin is notable for its low mintage and historical context. That year marked a shift in the composition of the coin, transitioning from 75% copper and 25% nickel to pure nickel.
The 1981 "NO SD" Two-Cent Coin
The 1981 "NO SD" two-cent coin is an exceptional Australian rare coin. It features a frilled-neck lizard, an emblematic representation of Australia's biodiversity, on the reverse. However, despite the coin’s design typically featuring the designer’s initials, “SD”, some issues from 1981 lack this element, contributing to the coin’s allure.
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Frequently asked questions
Australian coins are made from a mixture of copper, nickel and aluminium. The 5c, 10c, 20c and 50c coins are 75% copper and 25% nickel, while the $1 and $2 coins are made from 92% copper, 6% aluminium and 2% nickel. The original 50c coin was circular and contained 80% silver and 20% copper.
The minting process begins with an initial design brief. The Royal Australian Mint's product developers collaborate with coin designers and engineers to create an image that will translate well onto a coin. Once the design is approved, a three-dimensional model is sculpted using traditional plaster modelling with tools or 3D modelling software. Coin-shaped pieces, called blanks, are then cut from sheets of metal. These blanks are rolled through a machine with a groove in it, which makes a raised edge. They then go through a press, with the design for both sides being pressed into the coin at once.
The original 50c coin was circular and contained 80% silver and 20% copper. However, the metal in the coin quickly became worth more than 50c, so it was only produced for one year and then withdrawn from circulation. The coin was then issued in a dodecagonal (12-sided) shape starting in 1969. The dodecagonal version has a mass of 15.55g and a diameter of 31.5mm, while the round silver version had a mass of 13.28g and a diameter of 31.5mm.
