Deeper lying masses of this same silver, lead, and iron bearing rock, digested in and leached by hot waters and steam under great pressure, would seem to be a more likely source of the ore.
Is it not more rational to suppose with Richthofen that these are related as cause and effect, rather than that cold water has leachedthe ore and the silica from the walls near the surface?
They leached the tannic acid flavor with lye and brought them to a par with the sweet acorns of White Oak.
A regular woven bark bag held a quantity of acorns and the lye was leached out by washing the whole bagful in several changes of warm water.
The sumach is leached and assists both in tanning and bleaching as the liquor works through the round.
The myrabs and valonia were leached together, and the extract added to the best leach to make layer liquors of the required strength.
The owner plowed it up, raised a crop, put a moderate quantity of stable-manure, and ten loads of leached ashes to the acre.
Any good garden soil may be made to produce large crops; good, well rotted stable-manure and leached ashes are the best.
In a damper climate, or where there was more or less rain, the bird-droppings would putrefy, and the ammonia would be liable to evaporate, or to be leached out by the rain.
This may be leached day after day, slowly and imperceptibly, with no heat, or smell, to attract attention.
Much of the guano of the present day bears about the same relation to genuine old-fashioned guano, as leached ashes do to unleached, or as a ton of manure that has been leached in the barn-yard does to a ton that has been kept under cover.
A pound of nitrogen in the leached guano is not as available or as valuable as a pound of nitrogen in the unleached guano.
If it were any less soluble than it is, it would have all leached out of the land centuries ago.
Some plant nutrients are much more easily leached out than others.
Soil nutrients are dissolved by rain and leached from surface layers, transported to the subsoil, thence the ground water, and ultimately into the salty sea.
What compost I don't spread during fall is protected with plastic from being leached by winter rainfall and will be used next spring.
In verdant, rainy climates the soil is leached of plant nutrients and the food grown there is much less nutritious.
Wood ashes long exposed to rain lose most of their valuable contents, and leached ashes are only of small value.
Accumulations of sheep and goat manure in a dry situation, that is, where not leached out by heavy rainfall, have been found to run as high as $13 per ton in fertilizing constituents.
A large part of the plant-food materials have leached out of the mulch by spring, and have become incorporated in the soil, where the plant makes ready use of them.
Good cucumbers are sometimes grown in hills surrounding a barrel in which manure is placed to be leached out by successive waterings.
The ashes of land-plants are leached in pots to dissolve K2CO3; hence it is called potash.
The increased concentration of the second sample is due to unextracted bleach passing out of the mixing tank and gradually becoming leached as the tank contents are run off.
The author has used pine, oak, and cypress tanks but all were rapidly leached by the hypochlorite and ultimately had to be lined with concrete.
We have seen that fertilizing matter cannot be leached out of a good soil, in any material quantity, but can only be carried down to a depth of about thirty-four inches.
Does continued decomposition continue to prepare material to be leached away?
Among the mineral manures which have not yet been mentioned--not coming strictly under any of the preceding heads, is the one known as leached ashes.
Farmers have generally overrated the value of leached ashes, because they contain small quantities of available phosphate of lime, and soluble silicates, in which most old soils are deficient.
Why are leached ashes inferior to those that have not been leached?
If the decomposition of animal bodies takes place in exposed situations, and without proper precautions, the ammonia escapes into the atmosphere, and much of the mineral portion is leached out by rains.
Then water or water and urine was poured upon it until the mass was thoroughly leached or exhausted.
Should the quantity prove sufficiently large, it may be leached out in the usual way by hyposulphites.
These dissolve the gold, which is leached from the tailings, passed through boxes in which it is precipitated either by means of zinc shavings, electricity, or other precipitant.
No solution leachedfrom the pulp, containing cyanide of potassium, gold and silver, need be run to waste, which is in itself an enormous saving over the use of zinc shavings when handling large quantities of pulp and solution.
The solution is removed by ladles or by siphons, and the residue is leached out with boiling water; this removes the sulphates.
The liquors are run off from the vats to the electrolysing baths or precipitating tanks, and the leached ores are removed by means of doors in the sides of the vats into wagons.
The former is but slightly weathered, while the latter is so old that it is deeply reddened by oxidation and is leached of its soluble ingredients such as lime.
Their iron was leached out and carried away to be laid in the Algonkian water bodies in beds of iron carbonate and other iron compounds.
To a somewhat less depth it has been leached of its lime and other soluble ingredients.
In part it is derived from old residual clays, which in the making had been leached of the lime and other soluble ingredients of the rock from which they weathered.
In wet ground iron compounds leached by ground water from the soil often collect in reddish deposits a few feet below the surface, where their downward progress is arrested by some impervious clay.
This benefit may well amount to something when we add to peat one-fifth of its bulk of marl or leached ashes, but the question comes up: Do these insoluble mild alkalies exert any direct action?
During the Civil War the floor of the lower or main cave was also dug up for making saltpeter and much of the leached earth piled in front of the cave.
In the front portion of the main cavern the dry earth is 5 feet deep in its thickest part; but as it has all been leached for obtaining the saltpeter or niter diffused through it, none of it is in the original position.
Much of the cave earth has been hauled away for fertilizer, or leached for obtaining saltpeter, so that only a small quantity remains in front.
Yet it is necessary in cases of unusual materials, such as leached gossans, and it is desirable to have it done sooner or later in going mines, as a check.
If the ore is of unusual character, as in leached deposits, as said before, resort must be had to the second method.
The glaciers that ploughed the land preparatory to the present harvest gathered together a great variety of rock debris, much of it broken and unweathered and not leached of its more soluble constituents.
Beneath this the only sign of weathering apparent in the rock is the rusty hue imparted by the oxidised iron which the percolating rain hasleached from iron-bearing minerals.
The rains and frosts disintegrate the hills; and the rivers roll to the sea the finely divided particles into which they have been resolved; as well as the salts which have been leached from them.
And potash can be leached out of the charcoal or from its ashes whenever it is burned.
This is harvested with ocean reapers run by gasoline engines and brought in barges to the shore, where it may be dried and used locally as a fertilizer or burned and the potassium chloride leached out of the charcoal ashes.
Water poured over the ashes leachedout the lye, which drained into a bucket beneath.
It contains a lot of extra alumina, but after roasting in a kiln the potassium sulfate can be leached out.
Gold, silver, and lead are not easily leached out of the surface outcrops.
Certain constituents of the original rock are leached out and carried away, leaving other constituents, as oxides and hydrates, in sufficiently large percentage in the mass to be commercially available.
Whether they are due to magmatic solutions carrying boric acid from the associated flows, or to surface waters carrying materials leached from other sediments, is not clear.
In the weathering of these rocks the soda, being one of the more soluble materials, is leached out and carried off by ground-waters, and in the end a large part of it reaches the sea.
Near the surface the copper is leached out and carried down by waters containing various solvents, particularly sulphuric acid from the oxidation of pyrite.
The iron minerals have been oxidized in place and the non-ferrous minerals have been leached out, leaving iron ores.
By the action of nitrifying bacteria on this organic matter, nitrate salts are believed to have formed which were leached out by surface and ground waters, and probably carried in solution to enclosed bodies of water.
Below the oxidized and leached zone there is evidence of deposition of a large amount of secondary copper sulphide in the form of chalcocite.
In the weathering of ordinary rocks the bases are leached out and carried away, leaving a porous mass of clay (hydrous aluminum silicates), quartz, and iron oxide.
These dissolve the gold, which is leached from the tailings, passed through boxes in which it is precipitated either by means of zinc shavings, electricity, or to the precipitant.
It can be obtained from hardwood ashes, and every bit of these should be saved for the garden and stored in a dry place where they will not become leached out by the action of water.
