| Show SORTED AND SAMPLED fl where copper sulphide ore or occurs disseminated in a mass of decayed rock as in diorite or granite the ore is usually a good concentrating material and should be so treated unless occurring in sufficient abundance in tha rock to make it economy to send it to the smelter direct without attempting 0 hydraulic classification fi and mechanical anical concentration there is a ruling to the effect that when making application for a mineral patent the applicant must furnish specific proof that at least tsoo worth of work has been done or improvements maile made for each claim sought to be patented this worth of work or improvements may have all been made within a month of the date of location A patent may cover both a quartz and placer claim jointly A mineral upon whose surface forms resembling tress trees branches or masses mosses occurs is known as dendrite these markings frequently of much delicacy and beauty are due chiefly to the presence of certain metallic which have separated from the general mass of the mineral moss agate is an example of a dendrite the markings of it being due to the presence of oaid of manganese turquoise occurs in in ve inlets and small irregular masses the stone is hydrous phosphate of the delicate blue color is due to the presents presen cs of small amount of copper some varieties are gr green een these are not of value in some blue kinds the color fades to a peculiar green which destroys their value as gems it is not an unknown practice to artificially treat very light colored and comparatively worthless varieties of turquoise to give them a better color but this is not enduring one cannot be too careful in the handling of explosives in mining operations if dynamite or other nitroglycerin preparations are gradually warmed up to a temperature approaching their explosion temperatures they become very sensitive to the least shock or blow and once that point is reached they do not simply ignite but they explode with great violence and further owing to the poor conductivity of the mass a portion of it may become raised to this temperature pera ture and explode the whole one method of etching on steel zinc or other metals is to cover the portion to be etched with melted beeswax and then sketch with a needle or other suitable tool the design required being careful that the lines pass entire entirely lk t through the coating of wax to the metal beneath then mix one part nitric acid with two parts acid and apply to the prepared surface allow it to remain for f five ive or ten minutes according to the depth of etching desired then wash with water the wax may then be removed either by scraping or by 11 hot ot water |
