The Mexican mining journal (1915) (14592192720)

Identifier: mexicanminingjou1920unse (find matches)
Title: The Mexican mining journal
Year: 1905 (1900s)
Authors:
Subjects: Mines and mineral resources
Publisher: Mexico City : Mexican Pub. Co. S.A.
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign



Text Appearing Before Image:
ns,in addition to its own sample number, the numbersand marks used in the mine and elsewhere, and itsrecords are of importance only until the results aretransferred to the main record. The assay-office re-cords may be kept on a loose-leaf file, but. for a day-book a special book is preferable. After the assay results together with the corres-ponding numbers from the laboratory and the mine,are entered on the mine sampling record the descrip-tions of the samples are filled in from the samplingrecords- The work belongs to the duties of the surveydepartment and should not be left to the assay-officeforce. Forms for Keeping Records. The forms used for keeping the completed recordsof the sampling are of two kinds, one for horizontalor inclined workings and the other for shafts andwinzes, both made of rather stiff paper punched forfiling in a wall file. On the form for horizontal workingsthe line across the top contains the names of the mineand the working, the space below divided into nino
Text Appearing After Image:
215 MEXICAN MINING JOURNAL. June, 1915. columns. The first column gives marks, locations andnumber of section; the second, the mine sample num-ber; the third, indicates by letter whether from flooror roof; the fourth, the portion of the lode represented,whether foot or hanging wall side; the fifth, the assayvalue per short ton; the sixth, the mean assay value,all regular samples being in duplicate; the seventh,the width of samples in inches; the eighth, inches ofwidth multiplied by ounces of value; and the ninth,remarks, in which are recorded observations of thesampler regarding character of ore, appearance, mi-neral composition, etc. At the bottom of the recordof all samples of a given section, a line is drawn, andthe results for the section summarized, mean width,mean value, etc. The form used for shafts and winzes is similar tothe one described above, except that in the third columninstead of indicating the roof or floor the position ofthe sample in the vertical working is indicate