Page:Philosophical Transactions - Volume 001.djvu/353

 56. Whether the Vein be inclosed every way in its Coats; or whether it only lye between them?

57. Whether the Vein be every way of an uniform breadth, and thickness; and, if it be, what these Dimensions are; and, if not, in what places it varies, and in what measures? (The like Questions are to be made concerning the sparre, Caulk, and other Teguments or mixtures of the Ore?)

58. Whether the Vein be un-interrupted, or in some places broken off; and whether it be abruptly, or not; and whether it be by Vales, Brooks, Gullets, &c.

59. How wide the Interruptions are? what Signs, whereby to find the Vein again? whether the ulterior part or division of the Vein be of the same Nature, and hold on in the same Course, as to its tendency upwards or downwards, or Horizontally, Norward, Southward, &c. with the Vein, from which it is cut of?

60. Whether, in case the last end of the Vein be found, it terminate abruptly, or else end in some peculiar kind of Rock or Earth, which does, as it were, close or Seal it up, without leaving any crack or cranny, or otherwise? And whether the terminating part of the Vein tend upwards, downwards, or neither? And whether in the places, where the Vein is interrupted, there be any peculiar Stone or Earth, that does, as it were, seal up the Extremity of it?

61. Whether it be observed, that the Ore in Tract of time may be brought to afford any Silver or Gold, which it doth not afford, or more than it would afford, if it were not so ripe? And whether it have been found, that the Metalline part of the Vein grows so, that some part of the Mine will afford Ore or Metal in tract of time, that did not so before? and whether to this Maturation of the Mine, the being exposed to the free Air be necessary; or, whether at least it conduce to the Acceleration of it; or otherwise?

62. Whether all the Ore, contained in the Mine, be of the self-same nature and goodness; and, if not, what are the differing kinds; and how to be discriminated and estimated?

63. What is the fineness and goodnefs of the Ore, by which the Mine is wont to be estimated? And what are the marks and Rh