After the cessation of the engagement, one Placentia deserted from Carvajal's camp, and informed Mendoza that all the baggage belonging to Carvajal and his troops had been left at a place which he described about five or six leagues from Pocona, among which was a large quantity of gold and silver, several horses, and some musquets and powder. On this information, Meodoza set off immediately with his troops for that place, guided by the deserter; and marching diligently all the remainder of the night, he arrived quite unexpectedly at the place where Carvajal had secured his baggage; but as the night was exceedingly dark, above seventy of his men lost their way and fell behind. Yet, with such of his people as had kept up with him, Mendoza took possession of the whole without any resistance. After this, being sensible that he was not in sufficient force to cope with Carvajal, Mendoza resolved to retreat by way of the desert in which Centeno had formerly taken shelter, which he did accordingly with about fifty men, all the rest of his troops having fallen behind during the night, as already mentioned. In the prosecution of this plan of retreat, Mendoza and his people reached a certain river about two leagues and a half from Pocona, where they halted to take some rest and refreshment after the excessive fatigues of the past night. Carvajal was soon apprised of the capture of his baggage and the route which Mendoza had taken, and immediately set off in pursuit with about fifty of his best mounted troops; and, using every possible diligence, he came to the place where Mendoza had halted, about noon of the next day, and immediately attacked the royalists, some of whom were asleep, while others were taking food. Thus unexpectedly assailed, and believing that Carvajal was followed by his whole force, the royalists made a feeble resistance, and very soon took to flight, dispersing themselves in every direction. Lope de Mendoza and Pedro de Heredia, with a good many others, were made prisoners and Carvajal immediately ordered these two chiefs, and six or seven other principal persons among the royalists to be beheaded.
On this occasion Carvajal recovered the whole of his own baggage, and got possession of all that had belonged to the enemy, with all of which and the prisoners he had made, he returned to Pocona, engaging to do no injury to those who had escaped from the soldiers in the late attack, and even restored their horses arms and baggage to his prisoners, most of whom he sent off to join Gonzalo Pizarro. On leaving Pocona, he took Alfonso de Camargo and Luis Pardamo along with him, who had formerly fled along with Mendoza, and whose lives he now spared, as they gave him information respecting a considerable treasure which Centeno had concealed under ground near Paria, and where in fact he discovered above 50,000 crowns. After this, he went with his troops to the city of La Plata, where he proposed to reside for some time. At this place he appointed persons in whom he could confide to the offices of judges and magistrates, and dispatched intelligence of the success of his arms over the whole kingdom of Peru. He remained for some time at La Plata, where he collected treasure from all the surrounding country, under pretence of supplying Gonzalo Pizarro, but in reality he retained much the larger share for himself.
Having thus succeeded, in all his enterprizes and established his authority in the south of Peru on such firm foundations that no opposition remained in the whole country, fortune seemed to determine to exalt him to the summit of his desires by the discovery of the richest mines which had ever been known. Some Indians who belonged to Juan de Villareal, an inhabitant of La Plata, happening to pass over a very high isolated mountain in the middle of a plain, about eighteen leagues from that city, named Potosi, noticed by some indications that it contained mines of silver. They accordingly took away some specimens of the ore for trial, from which they found that the mineral was exceedingly rich in pure silver; insomuch that the poorest of the ore produced eighty marks of pure silver from the quintal of native mineral[25], being a more abundant production than any that ever had been heard of before. When this discovery became known in the city of La Plata, the magistrates went to the mountain of Potosi, which they divided among the inhabitants of their city, setting up boundary marks to distinguish the allotments or each person in those places which appeared eligible for workings. So great was the resort to these new mines, that in a short time there were above seven thousand Yanaconas, or Indian labourers, established in the neighbourhood, who were employed by their Christian masters in the various operations of these mines. These men laboured with so much industry, that each Indian, by agreement, furnished two marks or sixteen ounces of silver weekly to their respective masters; and so rich was the mine, that they were able to do this and to retain an equal quantity to themselves[26]. Such is the nature of the ore extracted from the mineral veins of this mountain, that it cannot be reduced in the ordinary manner by means of bellows, as is customary in other places. It is here smelted in certain small furnaces, called guairas by the Indians, which are supplied with a mixed fuel of charcoal and sheeps dung, and are blown up by the wind only, without the use of any mechanical contrivance.
[Footnote 25: This produce is most extraordinarily large, being equal to four parts of pure silver from ten of ore, or 640 ounces of silver from the quintal or 1600 ounces of ore. At the present time, the silver mines in Mexico, which are the most productive of any that have ever been known, are remarkable for the poverty of the mineral they contain. A quintal or 1600 ounces of ore affording only at an average 3 or 4 ounces of pure silver. The profit therefore of these must depend upon the abundance of ore, and the facility with which it is procured and smelted.--E.]
[Footnote 26: The gross amount of this production of silver, on the data in the text, is 11,648,000 ounces yearly; worth, at 5s. 6d. per ounce, L. 3,203,200 sterling; and, estimating silver in those days, at six times its present efficacy, worth L. 19,219,200 of modern value. In the present day before the revolutionary troubles, Humboldt estimates the entire production of gold and silver from Spanish and Portuguese America at L. 9,787,500; only about three times the quantity said to have been at first extracted from Potosi alone, and only about half the effective value.--E.]
These rich mines are known by the name of Potosi, which is that of the district, or province in which the mountain is situated. Owing to the easy labour and great profit experienced by the Indians at these mines, when any of the Yanaconas was once established at this place it was found almost impossible to induce them to leave it or to work elsewhere; and indeed, they were here so entirely concealed from all dangers, and so much exempted from their usual severe drudgery and the unwholesome vapours they had been subjected to in other mines, that they preferred working at Potosi to any other situation. So great was the concourse of inhabitants to Potosi, and the consequent demand for provisions, that the sack of maize was sold for twenty crowns, the sack of wheat for forty, and a small bag of coca for thirty dollars; and these articles rose afterwards to a higher price. Owing to the astonishing productiveness of these new mines, all the others in that part of Peru were speedily abandoned. Even those of Porco, whence Ferdinand Pizarro had formerly procured great riches, were left unwrought. All the Yanaconas who had been employed in searching for gold in the province of Carabaya, and in the auriferous rivers in different parts of southern Peru, flocked to Potosi, where they were able to make vastly more profit by their labour than in any other place. From various indications, those who are most experienced in mining believe that Potosi will always continue productive and cannot be easily exhausted[27].
[Footnote 27: It has however become very much exhausted, and has been in a great measure abandoned. The mines of Lauricocha, in a different part of Peru, are now in greater estimation. But those of Guanaxuato and Zacatecas in Mexico, notwithstanding the poverty of their ore, have been long the most productive of the American mines.--E.]
Carvajal did not fail to take advantage of this favourable discovery, and immediately set about the acquisition of treasure for himself by every means which his present uncontroulable power afforded. In the first place, he appropriated to his own use all the Yanaconas, or Indian labourers in the mines, which had belonged, to such of the inhabitants as had opposed him, or to those who had died or fled from the province. He likewise appropriated to his own use above 10,000 Peruvian sheep, belonging to the Yanaconas of the crown or to individuals, which were employed in transporting provisions for the miners. By these means, he amassed in a short time near 200,000 crowns, all of which he retained to his own use. His soldiers were so much dissatisfied with his conduct, as he gave them no share of his exactions, that they plotted together against him. Luis Pardamo, Alfonso de Comargo, Diego de Balsameda, and Diego de Luxan, with thirty others, who had entered into this conspiracy, had determined to put him to death about a month after his arrival in La Plata from his expedition against Mendoza; but, owing to some obstacles, they had been induced to deter the execution of their enterprize to a future period. By some unknown means the circumstances of this plot came to the knowledge of Carvajal, who put to death the before-mentioned leaders of the conspiracy, and ten or twelve others, and banished all the rest. By these merciless executions, in which he indulged on all occasions, Carvajal inspired so much terror that no one dared in future to make any similar attempt; as he not only punished in the severest manner all who evinced any intention of revolt, but put people to death on the slightest suspicion. Owing to this the loyal servants of his majesty may assuredly be exculpated from the blame which has been imputed to them, for not putting Carvajal to death: In reality, there were many persons sufficiently anxious to have done so, on purpose to escape from the cruel tyranny under which they groaned in secret; and four or five conspiracies were entered into for the purpose, which were all discovered, and occasioned the destruction of at least fifty individuals. By these means every one was terrified from attempting any thing against him, more especially as he gave high rewards to all who communicated any intelligence of the kind, so that all were forced to temporize and to wait in anxious hope of some favourable opportunity to deliver them from his cruel tyranny. Carvajal continued to remain at La Plata, frequently publishing accounts of the successes of Gonzalo Pizarro, to whom he often sent large remittances; derived from his own resources, from the royal fifths which he appropriated, and from the confiscated estates of those whom he put to death, all of which he seized upon, under pretence of supplying funds for prosecuting the war.
From the 18th of January 1546, the day on which he defeated the viceroy, Gonzalo Pizarro continued to reside at Quito till the middle of July of that year, accompanied by a force of about five hundred men, occupied in almost continual feastings and revelry. Various reasons were assigned for his long residence in that place; some alleging that it was on purpose to be more at hand for receiving early intelligence from Spain; while others attribute it to the great profits he derived from the gold mines which had been recently discovered in that neighbourhood; and others again alleged that he was detained by attachment to the lady formerly mentioned, whose husband he had procured to be assassinated by Vincente Pablo. That woman was delivered, after the death of her husband, of a child which was put to death by her father; for which inhuman action he was ordered to be hanged by Pedro de Puelles.
During his residence in Quito, Gonzalo Pizarro sent off several detachments of soldiers to different places, giving commissions and instructions to their commanders in his own name as governor of Peru. Among these, the lieutenant Benalcazar was sent back to his former government; having been pardoned and even taken into favour by Gonzalo. A reinforcement was also sent to Pedro de Valdivia who commanded in Chili, under the command of Captain Ulloa, whom he had sent to ask assistance to enable him to continue and maintain his conquests in that country. Other officers and soldiers were sent to other parts, which are unnecessary to be particularized. At length Gonzalo determined to leave Quito, and to establish his residence in Lima; and it has been alleged that he was principally induced to take this step from suspicion of the fidelity of Lorenzo de Aldana, his lieutenant at Lima, who was so much beloved by all the inhabitants of that city as to be almost in condition to have revolted to the royal cause. Gonzalo is said likewise to have been somewhat suspicious of his lieutenant-general Carvajal, being afraid lest he might be so puffed up by the many victories he had gained, and by his immense distance, as to be induced to set up for himself. He accordingly left Quito under the command of Pedro de Puelles, whom he appointed his lieutenant and captain-general in that province, with a force of three hundred men, having great confidence in his attachment ever since he had succoured him when in straits on his march from Cuzco to Lima, and when his army was on the point of abandoning him. He reposed so entirely on Puelles, that he believed, if the king were to send any force against him by the route of the province in which Benalcazar commanded, that Puelles would prevent them from being able to penetrate into Peru.