58 GEOLOGICAL RECONNOISSANCE 
erly enclosed between walls of the adjacent magnesian limestone, and now 
forms a conspicuous feature in the landscape of that region. (See plate 
No. 4.) 
The lead ore of this locality of Carroll county, may be expected to 
occur in following it, with its downward hade, through the different members 
of this formation, in irregular masses, “ pockets,” sheets, strings, and thin 
veins in the magnesian limestones; but probably sparingly, if at all, inter- 
spersed in the occasional layers of sandstone, which rock has, perhaps, not 
retained the openness of fissure, necessary for the reception of the infil- 
trated or insinuated ore.* 
About 20,000 pounds of lead ore have been raised, in all, at these “ dig- 
gings,” the excavations being, however, for the most part, only 5 to 15 
feet in depth. 
About 500 to 600 pounds were raised at the 40 feet, “ Brickey’s” shaft, 
adjacent to the isolated mass of sandstone, represented on plate No. 4. 
Judge Brickey, who has had long experience in the lead business, in 
Washington county, Missouri, is of opinion that the surface indications in 
township 20 north, range 19 west, of the 5th principal meridian, are fully 
as encouraging as in that part of Missouri, perhaps even more so, for 
profitable mining. 
The great difficulty in pursuing lead-mining in this part of Arkansas, at 
present, is the Want of furnaces for the reduction of ore which the miner 
could raise. 
For want of these, the ore has either to be smelted in heaps or log fur- 
naces at considerable loss and disadvantage, or transported at a cost which 
would consume the profits of the miner, to distant localities in Missouri, 
where smelting furnaces have been already erected. 
The most common vein-stone of this region is calcareous spar; some 
“ pozzin” is occasionally seen in the crevices; but oftener, near the surface, 
the materials filling the interstices of the magnesian limestones, are buff 
and grey argillaceous and shaly earths. ; 
The distance from these mines to navigation on White river, at Du 
Buque, is from 8 to 10 miles. The growth is, mostly, small sized black 
and post-oak and hickory. 
It will be observed, by the Chemical Report, that the lead ores, both of 
Carroll, Marion, and Independence counties, are, when freed from adhering 
gangue and rock, remarkable for their purity. The most important of 
them have been cupelled, to ascertain the amount of silver, but only one 
variety examined, up to the present time, viz: that from the Sewell 
* In some few instances, in Missouri, lead ore has been found in sufficient quantity in the sand- 
stone to pay for working. 
