Volume 24 (1872) (424 pages)

April 13, 1872.] SCIENTIFI © PRESS. 233 Loss of Quicksilver. (Written for the Paras by Guino Kusrex.} With reference to the article nnder the above heading in the Screntiric Press of March 16, 1872, the way to ascertain the amonnt of qnicksilver in the crude bullion or retorted amalgam should bo addod. Thero are cascs where the bullion shows the appearance of a perfect retorting, whore there is, nevertheless, a considerable omonnt of quicksilver; and again, sometimes mucli of the latter is supposed to be present where only a small percontage will be found. Occasionally it may be of importanee to know the quantity of weighing, notice the weight, say, 640.50; from this take off the weight of the pure cornet, 634.75. It gives a difference of 5.75, the amount of qniecksilver obtained from the bullion fragment, weighing 170. The percentage of quicksilver in the bullion is then easily found. 170:5.75=100 x x¥==575-170-=3.38 per cent. of mercury. The gold cornet is annealed sgain in order to drive out the quicksilver. It must show ‘its former weight. It should always be glowed and weighed before and after use. This method of determining the amount quicksilver in the bullion in order to de. cide whether it would be profitable to sub. ject it to anothor retorting or uot. The! assay is done correctly in a few minutes . by my miethod, reqniring only a glass . tube, an alcohol lamp, blowpipe, and a gold cornet. The latter may be procured from any assay oflice where gold bnillion is received, and one cornet will serve for many years, To make this way of assaying easily understood, it might be better to explain it by an oxample: First, take the cornet on a piece of charcoal and make it red-hot by means of the alcohol flame and blow-pipe, but carefully, for by applying a little too mnch heat it would melt. It is safor to take the cornet on a needle, and to hold itin the flame a few seconds till it gets red-hot. Weigh it out ona fiue gold balance and notice the weight of the cornet, say 634.75 (equal to 6.3475 grains). Tho weight will always be found the same after use when calcined, provided no fragment has been broken off accidentally. If it should weigh a little more after being heated this must be repeated, Next, take a small fragment out of the middle of the broken bnllion, best in one single piece, not heavier than from 150 to 200, (1% to 2 grains,) weigh it correctly and note it, say 170. This bullion fragment of 170 insert into a glass tube, the one end of which you close by melting it in thealcohol flame. The fragment a, in the drawing (of natnral size) is placed at the end of the tube, and thén the gold cornet 4, in wu distance, is represented. Take hold of the tube as shown with the fingers, and let the aleohol flame play over the part of the tube iu which the bullion is placed. The quioksilver will soon be observed as a gray coating at d, which, by increased heat, moves slowly towards 8, and is taken up by the gold cornet. After one or two minutes steady blowing, take the blowpipe and direct the flame on the bullion a, turning the tube slowly between the fingers. The glass tube will commence to melt by the increased heat and the rest of the mereury will be driven out. One minute blowing is generally sufficient, The tube is then allowed to cool down, keeping or placing it always horizontally, to prevent the sliding of the cornet. When cold, the cornet is rolled for a while in the tube, in order to take up some quicksilver globules that might be perceived in front or bohind the cornet, and if, by means of a magnifying glass, it is observed that no quicksilver ndheres to the sides of the tube, it is held inclined a little so that the cornet may slide out. At one end the cornet appears gray from quicksilver, the other shows pure good color. With this end it is placed on the balance as shown in Fig. 2, so that the amalgamated partis turned up, and weighed out. For this purpose the cornet must be examined with a magnifying’ glass, to be sure of there being no quicksilver on one end, otherwise it would amalgamate the gilded cup of ‘the scale, and cause much trouble in adjusting the balance afterwards. In such a case it is best to put a, small piece of paper on the cup, weigh it and the cornet together and subtract the of quicksilver in the bullion is also applicable to assaying quicksilver ores, with Fig. LI. Fig. IL. cfs If it should be observed that some water has precipitated inside the glass tnbe near the opening, it wonld not be safe to weigh the gold cornet direetly, butit mnst be first dried in a wider glass tube, which is kept for a short time in boiling water A Device for Preventing the Breakage of Lamp Chimneys. The accompanying cut isa representation of adevice for preventing lamp chimneys from breaking or cracking, by the contraction and expansion of the glass, under ordinary heat and usage. This device consists ofa piece of metal which is made of the shape shown, and is snspended on the upper end of the chimney so as to hang down a short distance in it, which, the inventors claim, serves hoth to regulate the draft and eqnalize the heat. The greatest disadvantage there is in using proper modification. It gives a more reliable assay than the usual way of assaying by retorting small qnantities, especially with poor ore, containing from 1 to 2 percent. of quicksilver. The ore must be dry Fig. 1. lamps is thefrequency with which the chimneys break, and numerous contrivances have been made to obviate it;this the inventors say will effectually prevent the breakage, as has been fully proven by numerous experiments, The and finely pulverized. Of this 100 milligrammes are weighed out, or 50, if over 20 per cent. quicksilver is supposed to be in the ore, and by means of a capsule introdued into a glass tube, into which a paper tube, a, as represented in Fig. 3, has been inserted. A few slight taps are applied on the tube to clear the sides of the paper tube, and then about three times the volume of the ore of carbonate of soda, c, is introduced over the ore, 0, The paper tube is then drawn out and the sides of the tube appear clean and clear. It must be mentioned yet that it is very important to drive out the water from the soda before use, by heatiug it in a porcelain or platina eup to nearly 2 red heat. When so prepared, the gold cornet is introduced again as described before, . in a horizontal position, and the end piece of metal can of course be applied on any chimney, and it is claimed that by its use the flame may, even when first hghted, be turned np so as to come out at the top of the chimney Without breaking the glass by sudden expansion. The cause is attribnted to the division of the draft at the upper end ofthe chimney by the hanging plate whereby it is steadied and the heat regulated. This little invention has been patented through the Screntrric PReEss Agency by C. M. Gruhy and T. I. Lichtig. The agent is O. V. Gerzabeck, No. 563, Market street, RaizRoap Convention.—Circulars have been received by a number of persons in this city, calling their atteution to the fact, that a Convention of Railroad men and engineers, interested in the narrow gauge system, wil be held in St. Louis on the 10th of June. The following persons are requested to attend: Officers of narrowoontaining the ore cautiously heated. If suddenly held in the flame, the soda might} bo thrown against thecornet. After five or six minutes, the heat must be increased by help of the blow pipe, which will cause the soda to melt. When cold, the quicksilver globules adhering to tho side of the tnbe are collected by the gold cornet as mentioned before. The weight above that of the cornet expresses the per centage of the quicksilver in the ore, provided paper weight from the cornet. After gauge roads, constructed, in course of construction or projected ; all dealers in, or mauufacturers of narrow gauge rails or equipments; all railroad engineers. A committee of arrangements has been appoiated, and an excursion to Denver City, where the Denver and Rio Grande narrowgauge railroad is'in operation, will be a feature of the Convention. Tre work of pumping out the Belliugham Bay coal mine is progressing slowly 100 milligrammes have been weighed out. but satisfactorily. Patents & Gf NVENTIONS. Full List of U.S. Patents Issued to Pacific Coast Inventors. (From Orrioun Reporta to DEWEY & Co., U0. 8. ann FoREIGN PaTENtT AGENTS, aND PUBLISHERS OF tHE SCIENTIFIO Press.) Fou THe WEEK Enpino Janvary 3n, 1872. Papen-Firre.—Jeremlah W. Foard, 8. F., Cal.; ante: dated Dec. 20, 1871. BuckKLE —Nathanlel D. Fowler, Valley Ford, al. Raiwway Swirou.—William H. Masturman and An. drew Jackson, Stockton, Cal. Device Fou SteEapING Wa4gon-PoLre.—Renben Austen Beaders, 8. F., Cal. Broaveast SowEn.—dJacob price, San Leandro, Baptlst Johnson, Irwin J. Truman and Robert M. Hamutton, 8. F., a»siguors to Livingstou L. Baker and Robert M. Hamilton, S. F,, Cal. For trum Werx Esnrxo Janvany lorn. Canniaor WurxL.— Charles Palmer, Hamilton, Nev. Yor THE Wrex Enpine January 30TH. Rorany Pumpe.—-Nathavlol P. Sheldon, 8. F., Cal. Cunine Lear Tovacco.—Jawes D. Oulp, Gilroy, Cal. AutiviciaL TEETIU.—Churles H. Mack, Portland, Or. Fon THE WrEK Espino Fepavany 611. Gnain-Supanatou.—dJoseph Esse, Redwood Clty, Cal. Jionsk-Powkr.—Samucl Pelton, Marysville. Cal, APPARATUA Foo EXHAUSTING Ami FROM PResenve-Cans. David N. Phelps, 8an Leandro, Cal. Buxe.—Danlel B. Rickey, 8. F., Cal. MANUFACTURE OF ALCONOLIC Spruirs.—Ianthia J, Rolfe and Joslah Rogers, Nevads City, Cal. Disn-Wasttno Macrine.—Cutharlne Woodruff, Antioch, Cal. Fou THE WEEK Enping Fesruany 137TB. Hone Poweu— clones C. Churchman, sacramento, “For THE WEEE Enpia Fenavany 20TH. GorueEr-Trsp.— John Bowman, Santa Cruz, Cal. MaTeRiaL Fon FILLing Matresses, Makryc Paper, Ere.— Francis C. Cone, 8. F., Cal. AMALGAMATOR.—George C. Langtry and George Em: mett, Gold Hill, Ney. For THE WEEK Enninac FEnroary 277TH. Woon PavemEntT.—Henry E. Perry, 8. F., Cal. For THE WEEK ENDING Marcy Sri. GE AnUCEEAHATON James ©. Bowden, Farmington, Cal. EnDLess-Rore Way.—David R. Smith, 8. F., Cal., assignor to Androw 8, Hallidie, same place. For THE WEEE Enpina Marce 12rn Oanc-PLow.—Samuel D, Bowen and Americas M. Abbott, Stockton, Cal. Brick-Kitn.—Francis Felix Boudrye, $8. F., Cal. Prermuration Lock.—William ©, Busse, $. F., Cal. aE oy Painting Wine-CloTH.—Samuel Graves, 8. F., Cal. Oane.PLow.—George W. Haines, Maino Prairie, Cal.; antedated March 7, 1872. Faicrion Excuve.—Wallace Hanscom, S. F. Cal. ExTension SHELF on BRackET.— Anthony Rosen ficld, .F,, Cal. QuaRTz-MILL.— William C. Stiles, Nevada City, Cal. For THE WEEK ENDING MagcH 197TH. Mepicazn CostpounD on Rueumario LinnNT.—John M. Cantrell, Polk county, Or. . WHEEL For VEHICLEs.—Oeorge R. Duval, Salem, Or. SUBMARINE AND OTHER WALLSs.—William H. Foye, 8. F., Cal. Harrow.—Oradon J. Leabo, Forest Grove, Or. APPARATUS FoR LIGHTING AND EXTINOUISHING Gas RY Execrnictry.—John Vassant, 8. F., Cal. AnmtaL-TraP.—James William Fishback How, Can yonville, Or. Spion-BoTTLe.—Joseph L. Likina, Vallejo, Cal.; dated March 14, 1872, anteNorz.—Copies af U. 8.and Forelgn Patents furnlshed by DewEx & Co.,in the shortest time possible by telegraph ar atherwise) at the lowest rates. All patent business for Pacific coast inventors transacted wlth greater security and in much less time than by any other agency Tur “Lost Leap.”—Recent advices from Arizona chronicle the discovery of what is supposed to be the long-sought-for‘Tost Lead,” within abont 10 miles from Mineral Park, Wallapai District, An old unnel has been found containing the tools of workmen, and the ledge is said to be a fine large one showing considerable horn silver. The old dump covers an acre of gronnd. The ‘Lost Lead” has formed the foundation for air-castles for many a miner in the ‘lower country,” and has been sought for by thousands. Its existence ig attested to by the annals of several of the Old Missions as wellas by the traditions of the Indians. It was generally supposed to be located somewherein the San Gabriel range or the San Bernardino mountains, and it is said that the old bells of the church at San Gabriel were made of silver obtained from the mine by the Jesuit Priests. When the Burro mines were discovered, many people supposed that the lost lead was somewhere in that vicinity so that the range of country iu which it.was supposed to be situated, was rather inflammable for any systematic prospecting. Whether this newly-discovered tunnelis one of the old mines referred to or not, it is nevertheless valuable, and somewhat singular, that, with a dump “covering an acreof ground,” it has not been found before. Doubtless the former owners were driven off by the hostile Indians, Goup Yrrtp.—The gold yield of Nevada county for the past two years has been $5,000,000 per annum, and it is estimated that, for the present year, it will reach $7,000,000,

April 13, 1872.] SCIENTIFI © PRESS. 233 Loss of Quicksilver. (Written for the Paras by Guino Kusrex.} With reference to the article nnder the above heading in the Screntiric Press of March 16, 1872, the way to ascertain the amonnt of qnicksilver in the crude bullion or retorted amalgam should bo addod. Thero are cascs where the bullion shows the appearance of a perfect retorting, whore there is, nevertheless, a considerable omonnt of quicksilver; and again, sometimes mucli of the latter is supposed to be present where only a small percontage will be found. Occasionally it may be of importanee to know the quantity of weighing, notice the weight, say, 640.50; from this take off the weight of the pure cornet, 634.75. It gives a difference of 5.75, the amount of qniecksilver obtained from the bullion fragment, weighing 170. The percentage of quicksilver in the bullion is then easily found. 170:5.75=100 x x¥==575-170-=3.38 per cent. of mercury. The gold cornet is annealed sgain in order to drive out the quicksilver. It must show ‘its former weight. It should always be glowed and weighed before and after use. This method of determining the amount quicksilver in the bullion in order to de. cide whether it would be profitable to sub. ject it to anothor retorting or uot. The! assay is done correctly in a few minutes . by my miethod, reqniring only a glass . tube, an alcohol lamp, blowpipe, and a gold cornet. The latter may be procured from any assay oflice where gold bnillion is received, and one cornet will serve for many years, To make this way of assaying easily understood, it might be better to explain it by an oxample: First, take the cornet on a piece of charcoal and make it red-hot by means of the alcohol flame and blow-pipe, but carefully, for by applying a little too mnch heat it would melt. It is safor to take the cornet on a needle, and to hold itin the flame a few seconds till it gets red-hot. Weigh it out ona fiue gold balance and notice the weight of the cornet, say 634.75 (equal to 6.3475 grains). Tho weight will always be found the same after use when calcined, provided no fragment has been broken off accidentally. If it should weigh a little more after being heated this must be repeated, Next, take a small fragment out of the middle of the broken bnllion, best in one single piece, not heavier than from 150 to 200, (1% to 2 grains,) weigh it correctly and note it, say 170. This bullion fragment of 170 insert into a glass tube, the one end of which you close by melting it in thealcohol flame. The fragment a, in the drawing (of natnral size) is placed at the end of the tube, and thén the gold cornet 4, in wu distance, is represented. Take hold of the tube as shown with the fingers, and let the aleohol flame play over the part of the tube iu which the bullion is placed. The quioksilver will soon be observed as a gray coating at d, which, by increased heat, moves slowly towards 8, and is taken up by the gold cornet. After one or two minutes steady blowing, take the blowpipe and direct the flame on the bullion a, turning the tube slowly between the fingers. The glass tube will commence to melt by the increased heat and the rest of the mereury will be driven out. One minute blowing is generally sufficient, The tube is then allowed to cool down, keeping or placing it always horizontally, to prevent the sliding of the cornet. When cold, the cornet is rolled for a while in the tube, in order to take up some quicksilver globules that might be perceived in front or bohind the cornet, and if, by means of a magnifying glass, it is observed that no quicksilver ndheres to the sides of the tube, it is held inclined a little so that the cornet may slide out. At one end the cornet appears gray from quicksilver, the other shows pure good color. With this end it is placed on the balance as shown in Fig. 2, so that the amalgamated partis turned up, and weighed out. For this purpose the cornet must be examined with a magnifying’ glass, to be sure of there being no quicksilver on one end, otherwise it would amalgamate the gilded cup of ‘the scale, and cause much trouble in adjusting the balance afterwards. In such a case it is best to put a, small piece of paper on the cup, weigh it and the cornet together and subtract the of quicksilver in the bullion is also applicable to assaying quicksilver ores, with Fig. LI. Fig. IL. cfs If it should be observed that some water has precipitated inside the glass tnbe near the opening, it wonld not be safe to weigh the gold cornet direetly, butit mnst be first dried in a wider glass tube, which is kept for a short time in boiling water A Device for Preventing the Breakage of Lamp Chimneys. The accompanying cut isa representation of adevice for preventing lamp chimneys from breaking or cracking, by the contraction and expansion of the glass, under ordinary heat and usage. This device consists ofa piece of metal which is made of the shape shown, and is snspended on the upper end of the chimney so as to hang down a short distance in it, which, the inventors claim, serves hoth to regulate the draft and eqnalize the heat. The greatest disadvantage there is in using proper modification. It gives a more reliable assay than the usual way of assaying by retorting small qnantities, especially with poor ore, containing from 1 to 2 percent. of quicksilver. The ore must be dry Fig. 1. lamps is thefrequency with which the chimneys break, and numerous contrivances have been made to obviate it;this the inventors say will effectually prevent the breakage, as has been fully proven by numerous experiments, The and finely pulverized. Of this 100 milligrammes are weighed out, or 50, if over 20 per cent. quicksilver is supposed to be in the ore, and by means of a capsule introdued into a glass tube, into which a paper tube, a, as represented in Fig. 3, has been inserted. A few slight taps are applied on the tube to clear the sides of the paper tube, and then about three times the volume of the ore of carbonate of soda, c, is introduced over the ore, 0, The paper tube is then drawn out and the sides of the tube appear clean and clear. It must be mentioned yet that it is very important to drive out the water from the soda before use, by heatiug it in a porcelain or platina eup to nearly 2 red heat. When so prepared, the gold cornet is introduced again as described before, . in a horizontal position, and the end piece of metal can of course be applied on any

chimney, and it is claimed that by its use the flame may, even when first hghted, be turned np so as to come out at the top of the chimney Without breaking the glass by sudden expansion. The cause is attribnted to the division of the draft at the upper end ofthe chimney by the hanging plate whereby it is steadied and the heat regulated. This little invention has been patented through the Screntrric PReEss Agency by C. M. Gruhy and T. I. Lichtig. The agent is O. V. Gerzabeck, No. 563, Market street, RaizRoap Convention.—Circulars have been received by a number of persons in this city, calling their atteution to the fact, that a Convention of Railroad men and engineers, interested in the narrow gauge system, wil be held in St. Louis on the 10th of June. The following persons are requested to attend: Officers of narrowoontaining the ore cautiously heated. If suddenly held in the flame, the soda might} bo thrown against thecornet. After five or six minutes, the heat must be increased by help of the blow pipe, which will cause the soda to melt. When cold, the quicksilver globules adhering to tho side of the tnbe are collected by the gold cornet as mentioned before. The weight above that of the cornet expresses the per centage of the quicksilver in the ore, provided paper weight from the cornet. After gauge roads, constructed, in course of construction or projected ; all dealers in, or mauufacturers of narrow gauge rails or equipments; all railroad engineers. A committee of arrangements has been appoiated, and an excursion to Denver City, where the Denver and Rio Grande narrowgauge railroad is'in operation, will be a feature of the Convention. Tre work of pumping out the Belliugham Bay coal mine is progressing slowly 100 milligrammes have been weighed out. but satisfactorily. Patents & Gf NVENTIONS. Full List of U.S. Patents Issued to Pacific Coast Inventors. (From Orrioun Reporta to DEWEY & Co., U0. 8. ann FoREIGN PaTENtT AGENTS, aND PUBLISHERS OF tHE SCIENTIFIO Press.) Fou THe WEEK Enpino Janvary 3n, 1872. Papen-Firre.—Jeremlah W. Foard, 8. F., Cal.; ante: dated Dec. 20, 1871. BuckKLE —Nathanlel D. Fowler, Valley Ford, al. Raiwway Swirou.—William H. Masturman and An. drew Jackson, Stockton, Cal. Device Fou SteEapING Wa4gon-PoLre.—Renben Austen Beaders, 8. F., Cal. Broaveast SowEn.—dJacob price, San Leandro, Baptlst Johnson, Irwin J. Truman and Robert M. Hamutton, 8. F., a»siguors to Livingstou L. Baker and Robert M. Hamilton, S. F,, Cal. For trum Werx Esnrxo Janvany lorn. Canniaor WurxL.— Charles Palmer, Hamilton, Nev. Yor THE Wrex Enpine January 30TH. Rorany Pumpe.—-Nathavlol P. Sheldon, 8. F., Cal. Cunine Lear Tovacco.—Jawes D. Oulp, Gilroy, Cal. AutiviciaL TEETIU.—Churles H. Mack, Portland, Or. Fon THE WrEK Espino Fepavany 611. Gnain-Supanatou.—dJoseph Esse, Redwood Clty, Cal. Jionsk-Powkr.—Samucl Pelton, Marysville. Cal, APPARATUA Foo EXHAUSTING Ami FROM PResenve-Cans. David N. Phelps, 8an Leandro, Cal. Buxe.—Danlel B. Rickey, 8. F., Cal. MANUFACTURE OF ALCONOLIC Spruirs.—Ianthia J, Rolfe and Joslah Rogers, Nevads City, Cal. Disn-Wasttno Macrine.—Cutharlne Woodruff, Antioch, Cal. Fou THE WEEK Enping Fesruany 137TB. Hone Poweu— clones C. Churchman, sacramento, “For THE WEEE Enpia Fenavany 20TH. GorueEr-Trsp.— John Bowman, Santa Cruz, Cal. MaTeRiaL Fon FILLing Matresses, Makryc Paper, Ere.— Francis C. Cone, 8. F., Cal. AMALGAMATOR.—George C. Langtry and George Em: mett, Gold Hill, Ney. For THE WEEK Enninac FEnroary 277TH. Woon PavemEntT.—Henry E. Perry, 8. F., Cal. For THE WEEK ENDING Marcy Sri. GE AnUCEEAHATON James ©. Bowden, Farmington, Cal. EnDLess-Rore Way.—David R. Smith, 8. F., Cal., assignor to Androw 8, Hallidie, same place. For THE WEEE Enpina Marce 12rn Oanc-PLow.—Samuel D, Bowen and Americas M. Abbott, Stockton, Cal. Brick-Kitn.—Francis Felix Boudrye, $8. F., Cal. Prermuration Lock.—William ©, Busse, $. F., Cal. aE oy Painting Wine-CloTH.—Samuel Graves, 8. F., Cal. Oane.PLow.—George W. Haines, Maino Prairie, Cal.; antedated March 7, 1872. Faicrion Excuve.—Wallace Hanscom, S. F. Cal. ExTension SHELF on BRackET.— Anthony Rosen ficld, .F,, Cal. QuaRTz-MILL.— William C. Stiles, Nevada City, Cal. For THE WEEK ENDING MagcH 197TH. Mepicazn CostpounD on Rueumario LinnNT.—John M. Cantrell, Polk county, Or. . WHEEL For VEHICLEs.—Oeorge R. Duval, Salem, Or. SUBMARINE AND OTHER WALLSs.—William H. Foye, 8. F., Cal. Harrow.—Oradon J. Leabo, Forest Grove, Or. APPARATUS FoR LIGHTING AND EXTINOUISHING Gas RY Execrnictry.—John Vassant, 8. F., Cal. AnmtaL-TraP.—James William Fishback How, Can yonville, Or. Spion-BoTTLe.—Joseph L. Likina, Vallejo, Cal.; dated March 14, 1872, anteNorz.—Copies af U. 8.and Forelgn Patents furnlshed by DewEx & Co.,in the shortest time possible by telegraph ar atherwise) at the lowest rates. All patent business for Pacific coast inventors transacted wlth greater security and in much less time than by any other agency Tur “Lost Leap.”—Recent advices from Arizona chronicle the discovery of what is supposed to be the long-sought-for‘Tost Lead,” within abont 10 miles from Mineral Park, Wallapai District, An old unnel has been found containing the tools of workmen, and the ledge is said to be a fine large one showing considerable horn silver. The old dump covers an acre of gronnd. The ‘Lost Lead” has formed the foundation for air-castles for many a miner in the ‘lower country,” and has been sought for by thousands. Its existence ig attested to by the annals of several of the Old Missions as wellas by the traditions of the Indians. It was generally supposed to be located somewherein the San Gabriel range or the San Bernardino mountains, and it is said that the old bells of the church at San Gabriel were made of silver obtained from the mine by the Jesuit Priests. When the Burro mines were discovered, many people supposed that the lost lead was somewhere in that vicinity so that the range of country iu which it.was supposed to be situated, was rather inflammable for any systematic prospecting. Whether this newly-discovered tunnelis one of the old mines referred to or not, it is nevertheless valuable, and somewhat singular, that, with a dump “covering an acreof ground,” it has not been found before. Doubtless the former owners were driven off by the hostile Indians, Goup Yrrtp.—The gold yield of Nevada county for the past two years has been $5,000,000 per annum, and it is estimated that, for the present year, it will reach $7,000,000,