The Flight of the Prospectors

The pursuit had begun. At the moment Clarence King’s telegram reached the Bank of California on November 25, 1872, Philip Arnold was already two thousand miles east, watching the Alleghenies rise through the window of a Pennsylvania Railroad car. The same hour found Asbury Harpending in motion through San Francisco’s waterfront district, moving between boarding houses and steamer offices with the particular haste of a man whose career had prepared him for reversals. The contrast between these two locations—Arnold’s deliberate transit toward fixed property, Harpending’s frantic circulation through temporary shelter—measured the distance between architect and instrument in the scheme now collapsing behind them.

Arnold’s journey had commenced before the exposure, not in response to it. The man who had begun as a hatter’s apprentice in Kentucky, who had enlisted for the Mexican-American War and emerged with the mobility of the unmoored, who had crossed to California for the Gold Rush of 1849 and returned with sufficient means to buy a farm and family name in Elizabethtown—this man had built departure into the fraud’s architecture. The $450, 000 he had extracted from the syndicate, payment for “the remainder of his rights to any future claim,” traveled with him in forms that left minimal trace. Bank drafts, letters of credit, perhaps some portion in the currency that had passed through so many hands in the preceding months: these accompanied him eastward through the mountain passes where he and Slack had once pretended to prospect.

The transcontinental connection, that triumph of the era’s engineering and capital formation, served the hoax’s principal author as it had served his victims. The same infrastructure that enabled Tiffany’s appraisers to reach San Francisco, that carried Henry Janin to the diamond field and Clarence King to its exposure, now removed its creator from the arena of accountability. Arnold sat in a Pullman car or day coach—records do not specify which—and watched the terrain of his invention recede. The two-story brick house in Elizabethtown awaited him. So did five hundred acres of farmland. These were not purchases made in flight; they were the destination of a journey begun years before, when Arnold first understood that western mineral speculation could be operated as confidence game rather than mining enterprise. He had managed to walk away from the hoax with more than half a million dollars.

John Slack followed a different vector. If Arnold’s path led toward visibility—the visible property, the visible return to origin—Slack’s led toward dissolution. The records offer less purchase on his movements, and this absence itself constitutes evidence. Where Arnold had operated as the scheme’s public face, its negotiator and its claimant, Slack had remained in the subordinate position that partners in fraud often occupy. He had traveled with Arnold to London and Amsterdam, had participated in the acquisition of uncut gems that salted the Colorado mesa, had shared in profits that followed. But when exposure came, he possessed neither Arnold’s preparation nor his destination.

The last documented location traces suggest a man moving laterally rather than retreating. Slack had connections in the mining towns of the West, networks formed through years of actual prospecting that preceded and perhaps enabled his turn to simulation. These communities, scattered across territories where federal authority remained intermittent and local judgment operated through informal codes, offered sanctuary. A man who knew which streams carried color, which slopes showed vein formations, which assay offices could be trusted and which bought their results—such a man could find employment requiring no accounting of recent history. Slack disappeared into this geography of temporary identity, leaving no property records, no newspaper interviews, no death notice that historians have recovered.

The divergence between these paths illuminated the structural logic of their partnership. Arnold had designed the hoax as finite operation with defined terminus. The syndicate’s incorporation, the public offering, the ten million dollars of capitalized value—these were not endpoints but instruments. The true endpoint was cash extraction preceding exposure, the $450, 000 payment converting potential into actual wealth. Slack, by contrast, appears to have operated without this architectural clarity, improvising response to collapse rather than executing predetermined plan.

Harpending’s search produced only absence. The secret agent who had secured the claim, who had guided investors to salted ground and witnessed their excavation of planted gems, could not locate the men whose liability he now shared. This failure was not merely personal; it was systemic. The syndicate’s structure had deliberately separated knowledge from accountability. Harpending knew the location but not the full mechanism of salting. Arnold and Slack knew the mechanism but had transferred legal title. The investors possessed capital but not direct access to the ground. This distribution, which had served the fraud’s construction, now served its dissolution. No single node contained sufficient information to reconstruct the complete chain, and the nodes were dispersing.

The legal instruments that might have enforced accountability required physical presence. Subpoenas, writs, attachments—these operated through territorial jurisdiction, through identification of bodies and assets within specific boundaries. Arnold’s Kentucky property lay within such boundaries, but his person proved elusive. Slack’s location remained unknown. Harpending, himself subject to inquiry, could not deliver what he did not possess. The syndicate’s ten million dollars of capital, already shaken by King’s telegram, now faced prospect of pursuing claims against defendants who had removed themselves from arena where claims could be processed.

The contrast between this dispersal and institutional concentration in San Francisco measured asymmetry of the crisis. At the Bank of California, William Ralston received Clarence King’s formal report alongside newspaper editorials questioning the geologist’s motives. The banker faced choice between acknowledging fraud and defending investment, between authority of federal science and interests of his institution. This choice, which would dominate following weeks, required presence—presence in offices, presence at meetings, presence before public that had subscribed to the diamond enterprise. Arnold, Slack, and increasingly Harpending had exempted themselves from this requirement. They had exchanged costs of presence for uncertainties of flight.

The geography of this flight extended beyond American borders. Arnold’s earlier journey to London, where he had acquired additional uncut gems with funds extracted from new investors, established pattern of international movement. The gems purchased there had served to maintain illusion of productive possibility while principals prepared extraction. This European connection, however briefly documented, suggested routes that federal jurisdiction could not easily follow. Atlantic steamers departing from New York and Boston carried passengers whose identities merged in mass of emigration and commerce. A man with bank drafts and no criminal conviction could travel these routes as legitimate traveler, his past confined to files of disappointed investors three thousand miles behind him.

The temporal structure of the flight compressed multiple operations into days that would normally require weeks. Arnold’s departure from San Francisco, his rail journey across continent, his establishment in Elizabethtown—these followed in rapid sequence, suggesting preparation that anticipated specific triggers. The telegram from King’s field party, the formal report to Ralston, the newspaper publication of exposure—these events unfolded across a week in late November 1872, but Arnold’s response operated on faster clock. He had built this acceleration into scheme’s architecture, ensuring that his extraction preceded moment when extraction would become impossible.

Slack’s timeline remains more obscure, but its obscurity itself suggests improvisation rather than planning. The man who had traveled with Arnold through Navajo territory in 1871, collecting chrome diopsides and pyrope garnets and ilmenites to mix with industrial diamonds, who had participated in London and Amsterdam gem purchases, who had stood beside Arnold while investors dug planted stones from Colorado soil—this man disappears from documentary record with completeness that implies either exceptional caution or exceptional misfortune. The western mining towns that might have received him operated through personal recognition rather than paper identity. A man without property, without family claims, without need to appear respectable could subsist in this environment indefinitely, his past known only to those who shared it.

Harpending’s position between these two models—Arnold’s calculated return to property, Slack’s dissolution into anonymity—defined particular peril of the intermediary. He had acted as syndicate’s agent, had signed documents and made representations creating legal obligations. His theatricality, the quality that Marc Hamilton would later embody in 1955 television dramatization, had served fraud’s presentation; it now served its exposure. Every room he had entered as man of substance, every hand he had shaken in confidence, now became site of potential recognition and recall. His flight could not follow Arnold’s path toward visible respectability, nor Slack’s toward complete disappearance. He remained trapped in geography of his own performance, moving through spaces where his face was known while seeking spaces where it might be forgotten.

The institutional response to this dispersal took shape in same days, but at different tempo. The San Francisco and New York Mining and Commercial Company, incorporated on authority of Henry Janin’s validating report, now faced inversion of that authority. Janin himself, the mining engineer whose favorable assessment had enabled ten-million-dollar capitalization, confronted wreckage of professional reputation. The directors who had accepted his judgment, who had authorized public offering and capital subscription, now searched for mechanisms of recourse against men who had removed themselves from recourse’s reach. The corporation, that modern instrument for concentrating capital and distributing risk, proved poorly designed for pursuing dispersed and mobile fraud.

The legal instruments available—civil suits for fraud, criminal charges for conspiracy, equitable claims for restitution—required defendants who could be served with process and assets that could be attached. Arnold’s Kentucky property offered target, but Kentucky courts operated with their own procedures and their own sympathies. A local man returned with wealth acquired in western speculation, claiming status of successful entrepreneur against claims of distant corporations—this figure could expect different reception than he would have faced in San Francisco. The circuit whereby capital sought validation from science and science gained funding from capital now demonstrated how established institutions could absorb losses and restructure obligations in ways unavailable to individuals. The corporation could negotiate settlements. The individuals who had operated through it faced personal ruin without corporate shelter.

The documentation of these days—company records, newspaper accounts, letters passing between directors and their attorneys—reveals search that produced increasingly certain absence. Arnold was in Kentucky; this could be established. Slack was somewhere; this could not be established. Harpending was moving, his location shifting faster than information could travel. The syndicate’s investigators, dispatched to trace these paths, found themselves operating in temporal lag. The train that carried Arnold eastward had departed before exposure was public. The routes that Slack might have taken branched into territories without telegraph connection. Harpending’s theatrical mobility made him visible in multiple locations simultaneously, each report of his presence arriving after his departure.

The concrete consequences of this dispersal accumulated in spaces where fraud had been constructed. The diamond field itself, the remote mesa in Colorado Territory where uncut gems had been planted among genuine mineral indicators, now awaited federal examination. Clarence King’s team, having identified the cut stone that proved salting, remained in field to document complete mechanism of deception. But the men who had performed the salting, who could have explained which stones were planted and which were natural, who could have demonstrated technique that had deceived Tiffany’s appraisers and Janin’s expertise—these men were not available for examination. The site spoke, but its authors had departed.

This vacancy shaped investigation that followed. King’s report, formally submitted and subsequently published, would reconstruct fraud’s physical evidence with scientific precision. But the human testimony that might have completed reconstruction—testimony about motives, about division of roles, about specific negotiations with London and Amsterdam gem dealers—remained unavailable. Arnold, in his Elizabethtown house, could refuse to travel westward to give evidence. Slack could not be found to refuse. Harpending, when eventually located, could claim limited knowledge appropriate to his intermediary position. The completeness of scientific exposure would be matched by incompleteness of legal accounting.

The asymmetry between these two forms of resolution—scientific certainty and legal frustration—would define hoax’s long-term significance. The Fortieth Parallel Survey, Clarence King’s federal enterprise, had demonstrated its capacity to detect fraud through trained observation and methodical documentation. The corporation, the bank, the syndicate had demonstrated their vulnerability to fraud through their own mechanisms of validation. The individuals who had exploited this vulnerability had demonstrated their capacity to extract its benefits while evading its costs. The system that emerged from these demonstrations was not system corrected but system revealed: its interconnections visible, its vulnerabilities mapped, its capacity for self-protection distinguished from its capacity for self-correction.

The pursuit continued in forms that pursuers had not anticipated. Not pursuit of bodies, increasingly, but pursuit of documents: the contracts that had transferred title, the letters that had represented value, the bank records that traced movement of extracted funds. Arnold’s Kentucky property became target of legal action rather than personal apprehension. The five hundred acres, the two-story brick house—these could be attached, litigated over, perhaps eventually recovered in part. But the $450, 000 had traveled through transformations that left no simple trail. Land purchased, improvements made, local obligations assumed—these converted liquid capital into fixed assets that resisted extraction. The fraud’s architecture, designed for conversion in one direction, now resisted conversion in the other.

Slack’s disappearance into western anonymity represented different form of successful extraction. Without property to attach, without location to serve process, he removed himself from legal system entirely. The mining towns that received him operated through different codes: personal reputation, physical capacity, willingness to work under conditions that respectable society avoided. His knowledge of actual prospecting, acquired in years before the hoax, served him in this environment. A man who could find color in a stream, who could read vein formations, who could operate simple machinery of extraction—such a man did not need to account for his past to secure his present. The frontier’s characteristic forgetfulness, its capacity to receive men without history, operated as sanctuary.

Harpending’s eventual location and disposition fall outside this chapter’s immediate scope. His theatricality, his capacity for reinvention, would serve him in years following 1872, producing new performances in new contexts. But in days of dispersal, his position remained critical. He possessed knowledge that Arnold and Slack had not shared: the specific negotiations with investors, the representations made in secured rooms, the understandings that had never been committed to paper. This knowledge made him valuable to syndicate’s attempts at recovery, and dangerous to their public position. His movements, tracked and untracked, shaped legal strategies that would be deployed in months ahead.

The void left by the prospectors’ disappearance created pressure for forensic proof of different order. Where human testimony was unavailable, physical evidence must suffice. Where the authors of fraud could not be examined, their work must speak for them. Clarence King’s team, still in Colorado field in late November 1872, confronted this necessity directly. The cut stone that had triggered exposure was one piece of larger pattern requiring documentation: the distribution of planted gems, the technique of their insertion, the natural geological features that had been exploited to suggest authentic mineralization. This documentation would proceed without cooperation of its subjects, constructing narrative of deception from material traces they had left behind.

The contrast between dispersal of fraud’s authors and concentration of its investigators measured different temporalities of flight and science. Arnold, Slack, and Harpending operated in the immediate, the urgent, the days and hours of evasion. King and his team operated in the extended, the methodical, the weeks and months of systematic examination. The first tempo produced absence; the second would produce report that made absence speak. Between these tempos, the institutions that had enabled the fraud sought their own forms of survival, negotiating between acknowledgment and defense, between authority of federal science and interests of subscribed capital.

The chase ended where it began: in gap between what could be proven and what could be known. Arnold in Elizabethtown, Slack in unknown location, Harpending in motion—these facts could be established. The complete narrative of their collaboration, the precise division of roles and profits, the full extent of their preparation and anticipation—these remained in realm of inference and reconstruction. The law would pursue what it could attach; science would document what it could observe; the institutions would absorb what they could not recover. The men themselves had exchanged uncertainties of presence for certainties of absence, leaving behind them only the material of their making and the void of their departure.

This void imposed its own demands. Without the prospectors to examine, without their testimony to challenge or confirm, the investigation that continued in Colorado field assumed heightened burden. Every stone must carry weight that human witness could not provide. Every geological anomaly must speak with clarity that cross-examination would have clarified. The empty space where Arnold and Slack should have stood became itself a form of evidence, a negative space that shaped how proof must be constructed and what proof must achieve. The investigators worked now in knowledge that their report would be contested not by contradictory testimony but by absence itself, by the silence of men who had made themselves unavailable to the questions their work had raised.