[1] Their business partnership eventually developed into a friendship, which led to the young Pedro Pascual being sent to Durañona's home in Portugalete to learn the trade of mineral dealer.

[1] The couple lived in Portugalete until 1870, when they moved to Bilbao, and they had five children: Juan Tomás (1870–1940), Casimira Casilda (1872–1968), Adriana Magdalena (1875), María Victoria (1877), and Ricardo (1880).

[2] His first daughter Casilda married José Joaquín Ampuero, belonging to a Durango family related to the Banco de Bilbao and numerous companies.

The lawsuit was resolved seven years later, in 1895, when the Supreme Court forced the dissolution of the company after issuing a ruling ordering its liquidation, which required the distribution of the assets.

He increased the iron mines that he was exploiting, either by buying or leasing wells, extending his activity to other places in the Spanish state, such as Córdoba.

[1] Gandarias was a pioneer and promoter of the use of natural and landscape wealth, as well as the possibilities and resources tourism that the region of Busturialdea and the Guerniquesado[a] in general promised.

[6] In this propitiatory framework, Gandarias, always attentive to the opportunities offered by the market and who had a great sensitivity to accumulation, maximization of profits, reinvestment and profit, landed in the region of the Guerniquesado with the acquisition of a large number of hamlets, mountains and various estates when purchasing from the properties that Eugénie de Montijo put up for sale.

[6] Arispe's negotiations were carried out with Gregorio Orueta y Gorriño and Pedro Allendesalazar y Zulueta, both of whom began acting as frontmen for Gandarias.

[6] On 9 December 1897, Orueta acquired the property of the "Echandia" mill and its belongings on behalf of Gandarias and three other businessmen from Gernika-Lumo, who provided him with the necessary capital, eleven thousand pesetas, to carry out the purchase operation, and then in the following year, on 26 November 1898, these four men and Orueta appeared in Pedernales (possibly at the Hotel Chacharramendi) before the notary of the Guernica District, José de Mendieta, to assign and transfer the Echandia mill to their favor, with Orueta renouncing all rights to said property, so that they could freely dispose of both the mill and its dam in order to allocate it to what they believed most convenient to their interests, which was its exploitation as a park for oyster farming.

[6] With the obtaining of this concession and together with the Echandia mill and its dam, Gandarias achieved his goal of establishing an oyster farming industry.

[1] Upon the death of his father in 1901, his oldest son Juan Tomás took charge of the family businesses, and in the following year, in Bilbao, he participated in the founding of Altos Hornos de Vizcaya, a Spanish metallurgy manufacturing company, which would ultimately be the pillar and the key piece on which he supported all of his businesses and empire, becoming the largest company in Spain for much of the 20th century, employing 40,000 workers at its height.