It is documented that in January 1891 a certain Jaume Climent, supposedly from Tremp, requests a concession for a gold mine that they call mina Natividad at the place named as Forat dels Diners, where he asks for 8 parcels (80,000 square metres) located in the municipality of Sant Salvador de Tolò (currently Gavet de la Conca). Once all the administrative procedures were completed, on 18 December 1891 the civil governor of Lleida sends to the chief of mining engineers of the province to make the demarcation of the requested area; the chief engineer turns out to be Lluís Marià Vidal, he draws up a record of the demarcation citing that the first point is marked at 7.3 metres and 200 degrees from the centre of the shaft or vertical cave of the Forat dels Diners, noting in the record that neither the applicants nor anyone representing them were present and three witnesses sign. On 27 December 1891 Lluís Marià Vidal delivers the plans and documentation to the civil government. On 4 February 1892 the civil governor issues an edict so that the applicant makes the payment established for the concession of the mine; this payment was never made and after various unsuccessful searches for this person, finally on 11 October 1892 the civil governor declares the mining concession expired. The doubt that remains is whether the drill holes that are observed at the entrance shaft were made by the applicants for the gold mine permit without being certain that they would be granted the exploitation, which surprises us. Or perhaps these had been made years earlier as the owner of the Hostal Roig explained in 1978. According to him, his ancestors called the hole Forat de les Gralles, and it was a narrow crack through which only jackdaws passed, but at some times of the year damp vapour came out from the interior, so they blasted the passage to see if they would find water inside; finding nothing they began to call it forat dels Diners, those who had spent for nothing. The first speleological exploration of which there are data was carried out by A.G. Cairol, R. Alsina and J. Griera, during the days 11 to 15 August 1966, these belonging to the GIE of the Club Excursionista de Gràcia. In 1978 Francesc Rubinat with other members of the GEFOMA, whom the owner of the Hostal Roig, who at that time was already an elderly person, accompanied to the hole, explained to them that his parents in the 19th century already knew the hole; these make the only topography that was known of the cavity until 2023. In 2018 members of the GESAM de Tremp observe a forat negre in the ceiling intuiting a continuity, but it is not until 2022 that members of the GESAM de Tremp and of the GREC de Barcelona carry out a climb of about 13 metres at a point in the hall and access an upper gallery of good dimensions with many formations. Later, in a collective interclubs activity in which members of the (GESAM), (SEPS del FEB), (ECMB), (GELL del CEL) and (GEPS) participate, they finish forcing a couple of passages and take the topographic data carrying out a topography that they make known in 2023. In 2023 Francesc Rubinat (ERE-CEC) and Juli Serrano (SIE-CEA) carry out a couple of outings to the cavity and carry out a new topography to complement the topography carried out by one of them 45 years earlier.

Speonomus puncticollis jeann.

Troglocharinus hustachei jeann.

Coleoptera catopidae subfamilia bathysciinae.

Collected by F. Rubinat and J. Ametller on 9 December 1978.