s 
106 ~ On the Mines of Derbyshire. 
Fig..19. Represents the elater ignitus. ais the mass of 
luminous substance of one side, seen indistinctly through 
the back part of the semitransparent portion of the coreelet. 
bis the luminous mass of the other side, exposed by re- 
moving a part of the shell of the corcelet. 
XIX. A List of about 280 Mines of Lead,—some with 
Zinc, Manganese, Copper, Iron, Fluor, Barytes, ec. in 
and near to Derbyshire. By Air. Joun Faxrey, Sen., 
Mineralogical Surveyor. 
Sir, J INCLOSE. a list of such mineral Veins or Mines as 
have been visited or information obtained concerning, in 
the. course of the mineral Survev in which I have been en- 
gaged, since the year 1807: I do not offer it as a complete 
list of the mines, but as a selection from the most pro- 
duciive and in,portant ones, or those which are calculated 
to illustrate some point of interest, in the progress of 
mining, or in a geological view. ~AsI observed respecting 
the List of Collieries (in your 35th volume, page 432), 
many of these Mines were long ago discontinued, but as in 
most instances, further quantities, of ore lay in the deep, 
below level or beneath the toadstone strata, the recording cf 
such, may not be without its uses, In the manuscript 
of the first volume of my Report, which is now printing by 
order of the Board of Agriculture, I have given an al- 
phabetical list of these mines, with the most important or 
remarkabie products, and particulars respecting each; 
which mines all produce blue lead ore or galena, I believe, 
and the greater part of them in rake-veins in the limestone 
rocks; and | there distinguish, the other variable and more 
rare particulars, such as pipe- veins, flat-works, and in which 
of the limestone rocks or toadstones, &c. they occur; ga- 
Jena being found in toadstone between the limestones, or 
in the shale above them; white or green ores of lead, or 
silver combined therewith in notable quantities: copper 
ore, calamine, black-jack, black-wad, pyrites (iron), ochres; 
fluor spars, blue-john, barytes, caltareous crystals; sulphur, 
bitumen, petroleum; china-clay, steatite; cherts, toad- 
stones, or clay-wayboards in. tbe strata or veins : crooked, 
crossing, haded or squinted rakes; caverns, slickensides, 
faults, gravel or extraneous fossils in the veins, &c. 
Without doubt, some mines that present instances, and 
perhaps, striking ones, of the particular phenomena men- 
tioned above, or perhaps other curious ones, have escaped 
‘ ne 
