92 
[Assembly 
INear Ramapo, there often are found in the granitic rocks, masses of 
magnetic oxide of iron, but this ore has not hitherto been found here 
in such quantities as to render it of any importance in an economical 
point of view. Thin strata of the hematitic ore also occasionally oc- 
cur, and there are some small deposits of the earthy black oxide of 
manganese. To these I may add peat, of which there are said to be 
several localities. 
The mineralogy of Rockland also includes the following, viz. 
Iron pyrites. 
Carbonate of copper and red oxide of copper — Staining the trap rocks 
near Ladenton. 
Zircon — In granitic bowlders, near Ladenton. 
Hornblende — Several varieties in the trap at Haverstraw, and else- 
where. 
Agate — In small nodules in trap. 
Quartz and feldspar — Several localities. 
ST. LAWRENCE COUNTY. 
Next to Orange, this county has the most extensive catalogue of mi- 
nerals of any in the State ; but in regard to the value of these products 
it may perhaps be placed at the head of the list. Embracing, as it 
does, such a large extent of territory, a part of which is still almost a 
wilderness, it is not surprising that it has been but partially explored. 
Indeed it will probably be a long time before its great mineral resources 
will be fully understood, or duly appreciated. 
The most important mineral at present known in this county is lead 
ore, which occurs in various places, but which is obtained in large 
quantities only in the vicinity of the village of Rossie. All the more 
important veins of this ore have been so fully described in the previous 
reports of the survey, that little need be said concerning them on the 
present occasion. I believe no new discoveries of any importance 
have been made during the last year, and the mining operations have 
not materially changed their character. There have been, it is true, 
as is generally the case in the business of mining, fluctuations in the 
prospects of those who are interested in these mines ; the veins some- 
times becoming narrower and less rich, and at others again, wider and 
more productive. But upon the whole, the condition of the mines is 
about the same as heretofore, with the exception that as the excava- 
tions proceed the expense of raising the ore is increased. 
