THE MAGISTRAL DISTRICT, STATE OF JALISCO. 397 
have reached a depth of about 300 feet, while the Magistral 
has reached 400 feet; none of them however, have been ex- 
tensively worked. A new lenze has been recently found in 
the Magistral, which is at present being exploited. The 
Magistral Company is operating a concentrator of a capa: 
city of fifty tons per day, which is to be increased to 100 
tons in the near future. The Company erected, some time 
ago, an involved plant for concentration by jigging as well 
as a small flotation unit, however, the results were very dis- 
appointing and it was considered that concentration of the: 
ore was very difficult if not impossible. Recently, however, 
changes were made, in which the original crushing plant 
was utilized. The ore is crushed through three stage rolls 
to 14 Mesh and the entire pulp passed over Isbell Tables 
with most excellent results. The middlings from the Is- 
bell Tables are recrushed in a small tube mill and passed 
over Wilfley Tables, which effect a further saving. This 
plant has demostrated that concentration gives excellent 
results on the ore, though we regret that we can give no 
exact data. 
A study of the Magistral District is of broader interest 
than is indicated by the limited territory covered, for the 
reason, that the District is representative of a large portion 
of the Districts laying on the long copper belt of whichit 
forms a part. Further sinking and more development may 
lead to the discovery of larger ore bodies in the Magistral 
District. 
Mexico, June 1913. 
