Questions & Answers about Hoy encontré el doble de cobre.
Why is it el doble de cobre instead of just doble cobre?
How would I add the emphatic sí que to this sentence to stress that I found a lot?
Since the word hoy means the day isn't over yet, shouldn't the verb be he encontrado?
In Latin American Spanish, it is completely standard to use the simple preterite (encontré) for finished actions, even if the time marker is an ongoing period like hoy or esta semana. Using the present perfect (he encontrado) for ongoing timeframes is a rule primarily followed in Spain.
Does the el [multiplier] de pattern work for other amounts too?
Yes! You can use this exact structure for other proportions. For example, "triple the copper" would be el triple de cobre, and "half the copper" would be la mitad de cobre.