450 PHILOSOPHICAL TRANSACTIONS. [aNNO I67O. 



Concerning the Copper Mine at Herrngroundt in Hungary. By Dr. 

 Edward Brojfn. N° 59, p- 1042. 



Herrngroundt is a little town, situated very high between two hills, upon a 

 part of land of the same name, an Hungarian mile distant from Newsol. In 

 this town is the entrance into a large copper-mine, very much digged. 



I went in through a cuniculus, called Tach-stoln, and continued divers hours 

 in the mine, and visited many of the most remarkable places in it. The steep 

 descents in this mine are made by ladders or trees set upright, with deep 

 notches or stairs cut in them, to stay the foot on. They are not troubled with 

 water, the mine lying high in the hill, so that the water can drain away ; but 

 they are molested with dust and damps. The veins of this mine are large ; 

 many of them cumulate; and the ore very rich; in 100 pounds of ore they 

 usually find 20 pounds of copper, sometimes 30, 40, 50, and even to 6o in 

 the hundred. Much of the ore is joined so fast to the rock, that it is separated 

 with much difficulty. There are divers sorts of ore, but the chief difference is 

 between the yellow and the black : the yellow is pure copper ore : the black 

 contains also a proportion of silver. 



They find no quicksilver here : the mother of the ore is yellow ; and the- 

 copper ore, heated and cast into water, makes it become like that of some sul- 

 phureous baths. They separate the metal from the ore with great difficulty. 

 The ore commonly passes ] 4 times through the furnaces : sometimes it is 

 burned, and other times melted ; sometimes by itself, and sometimes mixed 

 with other minerals and its own dross. 



There are divers sorts of vitriol found in this mine, green, blue, reddish 

 and white. There is also a green earth or sediment of a green water, called 

 Berg-grun. There are likewise stones found of a beautiful green and blue 

 colour, and one sort on which turcoises have been found; therefore called the 

 mother of the turcoise. 



There are also two springs of a vitriolate water, which are affirmed to turn 

 iron into copper.* They are called the old and the new Ziment. These 

 springs lie deep in the mine. The iron is usually left in the water 14 days. 



j4?i Account concerning the Baths of Austria and Hungary ; also some 



Stone Quarries, Talcum Rocks, &c. By the same. N" 59, p- 1044. 



Baden is a little city in Austria, four German miles southward from Vienna, 



seated on a plain, but near a ridge of hills, which are the excursions of mount 



Cetius. It is much resorted to for the natural baths of the place, where the 



♦ i. e. The vitriolic acid having a greater aflfinity to the iron than it has to the copper, this last rs 

 precipitated in a reguline state upon pieces of iron that are thrown into the abovementioned vitrioJate 

 water. 



