Kauri gum is resin from kauri trees (Agathis australis), which historically had several important industrial uses. It can also be used to make crafts such as jewellery. Kauri forests once covered much of the North Island of New Zealand, before early settlers caused the forests to retreat, causing several areas to revert to weeds, scrubs, and swamps. Even afterwards, ancient kauri fields and the remaining forests continued to provide a source for the gum. Between 1820 and 1900, over 90% of Kauri forests were logged or burnt by Europeans. Kauri gum forms when resin from kauri trees leaks out through fractures or cracks in the bark, hardening upon exposure to air. Lumps commonly fall to the ground and can be covered with soil and forest litter, eventually fossilising. Other lumps form as branches forked or trees are damaged, releasing the resin.
Uses
The Māori had many uses for the gum, which they called kapia. Fresh gum was used as a type of chewing gum (older gum was softened by soaking and mixing with juice of the puha thistle). Highly flammable, the gum was also used as a fire-starter, or bound in flax to act as a torch. Burnt and mixed with animal fat, it made a dark pigment for moko tattooing. Kauri gum was also crafted into jewellery, keepsakes and small decorative items. Like amber, kauri gum sometimes includes insects and plant material. Kauri gum was used commercially in varnish, and can be considered a type of copal (the name given to resin used in such a way). Kauri gum was particularly useful for this and, from the mid-1840s, was exported to London and America. Tentative exports had begun a few years earlier, for use in marine glue and as fire-kindlers; gum was part of an export cargo to Australia in 1814. Since kauri gum would mix more easily with linseed oil at lower temperatures, by the 1890s 70% of all oil varnishes made in England used kauri gum. It was used to a limited extent in paints during the late 19th century, and from 1910 was used extensively in manufacturing linoleum. From the 1930s, the market for gum dropped as synthetic alternatives were found, but there remained niche uses for the gum in jewellery and specialist high-grade varnish for violins. Kauri gum was Auckland's main export in the second half of the 19th century, sustaining much of the early growth of the city. Between 1850 and 1950, 450,000 tons of gum were exported. The peak in the gum market was 1899, with 11,116 tons exported that year, with a value of £600,000 ($989,700 US). The average annual export was more than 5,000 tons, with the average price gained £63 ($103.91 US) per ton.
Appearance The gum varied in colour depending on the condition of the original tree. It also depended on where the gum had formed and how long it had been buried. Colours ranged from chalky-white through red-brown to black. The most prized was pale gold, as it was hard and translucent. The size of each lump also varied greatly. Swamps tended to yield the small nuggets known as "chips", whereas hillsides tended to produce larger lumps. The majority were the size of acorns, although some were found which weighed a few pounds. The largest (and rarest) were reported to weigh half a hundredweight (25.4kg, 56lbs). Kauri gum shares a few characteristics with amber, another fossilised resin found in the Northern Hemisphere. While amber can be millions of years old, carbon-dating suggests the age of most kauri gum is a few thousand years.
Gumfields
Most of the gumfields were in Northland, Coromandel and Auckland, the site of the original kauri forests. Initially, the gum was readily accessible, commonly found lying on the ground. Captain Cook reported the presence of resinous lumps on the beach at Mercury Bay, Coromandel, in 1769, although he suspected it came from the mangroves, and missionary Samuel Marsden spoke of their presence in Northland in 1819. By 1850, most of the surface gum had been harvested, and people began digging for it. The hillsides yielded shallow-buried gum (about 1 m), but in swamps and beaches it was buried much deeper (4 m or below).
Gum-diggers
Gum-diggers were men and women who dug for kauri gum in the old kauri fields of New Zealand at the end of the 19th and early 20th centuries. The term may be a source for the nickname "Digger" given to New Zealand soldiers in World War I. In 1898, a gum-digger described "the life of a gum-digger" as "wretched, and one of the last [occupations] a man would take to." Gum-diggers worked in the old kauri fields, most of which were then covered by swamp or scrub, digging for gum. Much of the population was transient, moving from field to field, and they lived in rough huts or tents (which were called "whares", after the Maori for 'house'). It was extremely hard work and not well paid, but it attracted many Maori and European settlers, including women and children. There were many Dalmatians, who had first come to work the South Island goldfields in the 1860s. They were transient workers, rather than settlers, and much of their income was sent out of the country, resulting in resentment from the local workforce. In 1898, the "Kauri Gum Industry Act" was passed, which reserved gum-grounds for British subjects, and requiring all other diggers to be licensed. By 1910, only British subjects could hold gum-digging licences. Gum-digging was the major source of income for settlers in North Auckland, and farmers often worked the gumfields in the winter months to subsidise the poor income from their unbroken land. By the 1890s, 20,000 people were engaged in gum-digging, of which 7000 worked full-time. Gum-digging was not restricted to settlers or workers in the rural areas; Auckland families would cross the Waitematā Harbour by ferry at weekends to dig in the fields around Birkenhead, causing damage to public roads and private farms, and leading to local council management of the problem.
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