Fire-setting

Fire-setting is a method of mining used mostly in antiquity. Fires were set against a rock face to heat the stone, which was then doused with water causing the stone to fracture by thermal shock. This technique was best performed in opencast mines where the smoke and fumes could dissipate safely. The technique was very dangerous in underground workings without adequate ventilation. The method became redundant with the growth in use of explosives.

History



The method is first described by Diodorus Siculus in his Bibliotheca historica written about 60 BC, about methods of mining used in ancient Egyptian gold mines. It is also mentioned in greater detail by Pliny the Elder in his Naturalis Historia published in the first century AD. In Book XXXIII, he describes mining methods for gold, and the pursuit of the gold-bearing veins underground using tunnels and stopes. He mentions the use of vinegar to quench the hot rock, but water would have been just as effective as vinegar was expensive at the time for regular use in a mine. The reference to vinegar may come from a description by Livy of Hannibal's crossing of the Alps, when it was said that the soldiers used vinegar in fire-setting to remove large rocks in the path of his army.



Pliny also says that the method was used both in opencast and deep mining. That the method was used in practice is confirmed by remains found at the Roman gold mine of Dolaucothi in west Wales, when modern miners broke into much older workings during the 1930s where they found wood ashes near worked rock faces. In another part of the mine, there are three adits at different heights which have been driven through barren rock to the gold-bearing veins for some considerable distance, and they would have not only provided drainage but also ventilation to remove the smoke and hot gases during a fire-setting operation. They were certainly much larger in section than was normal for access galleries, and the draught of air through them would have been considerable.

Fire-setting would have been used extensively during opencast mining, and is also described by Pliny in connection with the use of another mining technique known as hushing. Aqueducts were built to supply copious amounts of water to the minehead, where they were used to fill tanks and cisterns. The water was unleashed to scour the hillside below, both soil in the case of prospecting for metal veins, and then rock debris after a vein had been found. Fire-setting was used to break up the hard rocks of the vein itself and surrounding barren rock, and was much safer than use in underground workings since the smoke and fumes would be dissipated much more easily than in a confined space underground. Pliny also describes undermining methods were used to facilitate attack of the hard rocks, and probably the softer alluvial deposits too.

Agricola



The method continued in use in the medieval period, and is described by Georg Agricola in his treatise on mining and mineral extraction, De Re Metallica. He warns about the problem of the "foetid vapours" and the need to evacuate the workings while the fires are lit, and presumably for some time afterwards until the gases and smoke had cleared. The problem raises the question of ventilation means in the mines, a problem often solved by ensuring that there was a continuous path for escape of the noxious fumes, perhaps aided by artificial ventilation. Agricola mentions the use of large water-powered bellows to create a draught, and continuity of workings to the surface were essential for a stream of air to run through them.

In later times, a fire at the base of a shaft was used to create an updraught, but just like fire-setting, it was a hazardous and dangerous procedure, especially in collieries. As the number and complexity of the underground workings increased, care was needed to channel the air draught to all parts of the tunnels and faces. It was usually achieved by installing doors at key points. Most of the deaths in coal mine disasters were caused by inhalation of the toxic gases produced by firedamp explosions.



The method continued in use for many years afterwards until finally made redundant by the use of explosives. However, they also produce toxic gases and care is needed to ensure good ventilation to remove those gases, like carbon monoxide, as well as choice of the explosive itself to minimise their emission.

From http://en.wikipedia.org/